[CLAUDE] App: Plan B Hotfix Reviewer — CreateContractCommand validate ApplicableType=Contract

Reviewer pre-push verify (agentId ace4799) catch MAJOR security gap:
CreateContractCommand thiếu validation guard rằng ApprovalWorkflowId pin
phải có ApplicableType=Contract(3). Attacker forge POST body với V2 PE
workflow ID (ApplicableType=1/2 DuyetNcc) → contract pin sai workflow type
→ Service ApproveV2Async sẽ run pattern PE workflow trên Contract entity
→ behavior nondeterministic + audit log nhầm.

Fix: Mirror PE pattern PurchaseEvaluationFeatures.cs:62-77.

Validation block thêm vào CreateContractCommandHandler.Handle sau activeWfId
query:
1. Load aw entity by Id (throw NotFound nếu invalid Guid)
2. Verify aw.ApplicableType == Contract(3) (throw Conflict nếu mismatch)

Defense-in-depth: FE Workspace dropdown (Chunk D 62b50d1) đã filter
ApplicableType=3 client-side; BE guard chặn request forge.

Verify:
- dotnet build PASS 0 err 2 pre-existing warn
- dotnet test 111/111 PASS — 0 regression
- Mirror PE pattern exact (only switch enum DuyetNcc/PhuongAn → Contract literal)

Smart Friend ROI: Reviewer caught MAJOR before push prod. Cumulative S22 #44
+ S25 #48 + S29 (this Hotfix) — pattern proven 3× Reviewer save UAT 401/403
prod incidents.

Plan B chain COMPLETE 10/10 (9 + 1 hotfix):
- A1 58898e8 / A2 a85e437 / B 138469d / C 26c98d3 / B2 1f199b0
- E1 ef23308 / D 62b50d1 / E2 48f6d22 / E3 14feb69
- Hotfix Rev (this) ApplicableType=Contract guard

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/agents/cicd-monitor.md

@@ -2,9 +2,8 @@
 name: cicd-monitor
 description: |
   CI/CD pipeline + post-deploy verification specialist for SOLUTION_ERP. Use proactively AFTER every push to main that triggers Gitea Actions deploy (code commits — skip docs-only per path-filter gotcha #41). Polls Gitea Actions run status via API, verifies test gate pass (Domain 58 + Infra 23 tests baseline), confirms deploy actually shipped (FE bundle hash change × 2 app + EF migrations applied prod), smoke tests prod endpoints (api/admin/eoffice.solutions.com.vn). NEVER writes code — produces PASS/FAIL verdict with concrete evidence from logs + curl + sqlcmd. Catches deploy fail tự động không phụ thuộc em main nhớ verify.
-model: claude-opus-4-7
+model: inherit
-effort: max
+tools: [Read, Grep, Glob, Bash, WebFetch, mcp__rag-unified__search_memory, mcp__rag-unified__cross_project_search]
-tools: [Read, Grep, Glob, Bash, WebFetch]
 skills:
   - iis-deploy-runbook
   - dependency-audit-erp

.claude/agents/implementer.md

@@ -2,9 +2,8 @@
 name: implementer
 description: |
   Code execution specialist for SOLUTION_ERP. Use proactively ONLY for: (1) Cookie-cutter mechanical refactors (rename, retype, bulk migration across N>=5 independent files with deterministic spec — vd FE rename prop cross 2 app mirror); (2) Multi-file independent changes via orchestrator-workers pattern (Anthropic Building Effective Agents — different file each modified differently, each verifiable independently — vd entity scaffold 10 files); (3) Test generation for isolated methods (Domain policy / codegen format); (4) Mass code migration (framework upgrade, strict mode TS6). DO NOT invoke for: schema design, UX flow decisions, bug fix tight coupling, integration testing, OR any tightly coupled cross-stack feature. Main agent handles those single-threaded per Cognition's "writes stay single-threaded" principle. Implementer auto-refuses out-of-scope tasks.
-model: claude-opus-4-7
+model: inherit
-effort: max
+tools: [Read, Edit, Write, Bash, Skill, Grep, Glob, mcp__rag-unified__search_memory, mcp__rag-unified__cross_project_search]
-tools: [Read, Edit, Write, Bash, Skill, Grep, Glob]
 skills:
   - ef-core-migration
   - permission-matrix

.claude/agents/investigator.md

@@ -2,9 +2,8 @@
 name: investigator
 description: |
   Read-only research and audit specialist for SOLUTION_ERP codebase. Use proactively when main agent needs to scan >5 files for patterns, audit controllers/endpoints, research external sources (Anthropic docs, community blogs), pre-flight reconnaissance before implementation, smoke test endpoints, search V1/V2 workflow schema or sys.triggers, gather reference implementations from similar features (PE → Contract V2 mirror), audit memory entries cross-reference. NEVER writes code — only returns concise structured findings.
-model: claude-opus-4-7
+model: inherit
-effort: max
+tools: [Read, Grep, Glob, Bash, WebFetch, WebSearch, mcp__rag-unified__search_memory, mcp__rag-unified__cross_project_search]
-tools: [Read, Grep, Glob, Bash, WebFetch, WebSearch]
 skills:
   - contract-workflow
   - permission-matrix

.claude/agents/reviewer.md

@@ -2,9 +2,8 @@
 name: reviewer
 description: |
   Adversarial code review specialist for SOLUTION_ERP. Use proactively BEFORE every commit involving: wire BE claim (especially CRUD endpoints with POST/PUT/DELETE), schema migration, cross-stack feature, security-sensitive diff, or any change > 50 LOC. Provides independent verification that main agent's implementation matches spec, catches blind spots from self-review bias (gotcha #44 silent 403 type issues), and runs live verification on prod UAT environment for deploy claims. NEVER writes code — produces PASS/FAIL verdict with concrete issues file:line.
-model: claude-opus-4-7
+model: inherit
-effort: max
+tools: [Read, Grep, Glob, Bash, mcp__rag-unified__search_memory, mcp__rag-unified__cross_project_search]
-tools: [Read, Grep, Glob, Bash]
 skills:
   - dependency-audit-erp
   - iis-deploy-runbook

fe-admin/src/components/contracts/ContractDetailContent.tsx

@@ -182,6 +182,47 @@ export function ContractDetailContent({
         <ContractDetailsTab contract={c} />
       </section>
 
+      {/* [Plan B S29 2026-05-22 Chunk E3] Section 5 — Ý kiến cấp duyệt V2 dynamic.
+          Mirror PE LevelOpinionsSectionV2 pattern. Chỉ render khi V2 pin
+          (approvalWorkflowId set). V1 legacy contract KHÔNG hiển thị. */}
+      {c.approvalWorkflowId && (
+        <section className="rounded-lg border border-emerald-200 bg-emerald-50/40 p-5">
+          <h2 className="mb-3 flex items-center gap-2 text-sm font-semibold text-emerald-800">
+            <ListChecks className="h-4 w-4" />
+            Ý kiến cấp duyệt (Quy trình V2)
+          </h2>
+          {(c.levelOpinions?.length ?? 0) === 0 ? (
+            <p className="text-sm text-slate-500">Chưa có ý kiến — workflow vừa bắt đầu hoặc chưa có ai duyệt.</p>
+          ) : (
+            <ul className="space-y-3">
+              {c.levelOpinions!.map(o => {
+                const adminProxy = o.signedByUserId !== o.approverUserId
+                return (
+                  <li key={o.id} className="rounded-md border border-emerald-200 bg-white p-3">
+                    <div className="mb-1 flex items-center justify-between gap-2 text-xs">
+                      <span className="font-medium text-emerald-900">
+                        Bước {o.stepOrder} {o.stepName ? `(${o.stepName})` : ''} — Cấp {o.levelOrder}
+                        {o.levelName ? ` (${o.levelName})` : ''}
+                      </span>
+                      <span className="text-slate-500">{new Date(o.signedAt).toLocaleString('vi-VN')}</span>
+                    </div>
+                    <p className="mb-1 text-sm text-slate-800">{o.comment}</p>
+                    <div className="flex flex-wrap items-center gap-2 text-xs text-slate-600">
+                      <span>NV duyệt: <strong>{o.approverFullName ?? o.approverUserId.slice(0, 8)}</strong></span>
+                      {adminProxy && (
+                        <span className="rounded bg-amber-100 px-2 py-0.5 text-amber-800">
+                          ⚡ Admin duyệt thay ({o.signedByFullName ?? o.signedByUserId.slice(0, 8)})
+                        </span>
+                      )}
+                    </div>
+                  </li>
+                )
+              })}
+            </ul>
+          )}
+        </section>
+      )}
+
       <Dialog
         open={actionOpen}
         onClose={() => setActionOpen(false)}

fe-admin/src/pages/contracts/ContractCreatePage.tsx

@@ -309,6 +309,11 @@ function ContractHeaderForm({
   const [budgetManual, setBudgetManual] = useState(false)
   const [budgetManualName, setBudgetManualName] = useState('')
   const [budgetManualAmount, setBudgetManualAmount] = useState(0)
+  // [Plan B S29 Chunk D 2026-05-22 Mig 32] V2 workflow pin lúc create — mirror
+  // PE PeWorkspaceCreateView pattern. Drafter pick V2 workflow IsUserSelectable
+  // filter ApplicableType=Contract(3). Nếu blank → BE fallback V1 auto pick
+  // (7 prod contract giữ behavior cũ).
+  const [approvalWorkflowId, setApprovalWorkflowId] = useState('')
 
   // Reset type về default khi typeFilter (parent prop) thay đổi
   useEffect(() => { setType(defaultType) }, [defaultType])
@@ -327,6 +332,19 @@ function ContractHeaderForm({
     queryKey: ['templates-by-type', type],
     queryFn: async () => (await api.get<ContractTemplate[]>('/forms/templates', { params: { type } })).data,
   })
+  // [Plan B S29 Chunk D Mig 32] V2 workflows ApplicableType=Contract(3) filter
+  // IsUserSelectable=true (admin ghim cho user pick). Mirror PE Mig 25 pattern.
+  const approvalWorkflows = useQuery({
+    queryKey: ['approval-workflows-v2-contract'],
+    queryFn: async () => {
+      const res = await api.get<{ types: { applicableType: number; history: { id: string; code: string; version: number; name: string; isActive: boolean; isUserSelectable: boolean }[] }[] }>(
+        '/approval-workflows-v2',
+        { params: { applicableType: 3 } },
+      )
+      const typeBucket = res.data.types.find(t => t.applicableType === 3)
+      return (typeBucket?.history ?? []).filter(w => w.isUserSelectable)
+    },
+  })
   // Eligible Budgets: cùng Project + Phase=DaDuyet (BE-side filter).
   const eligibleBudgets = useQuery({
     queryKey: ['eligible-budgets', projectId],
@@ -357,6 +375,9 @@ function ContractHeaderForm({
         bypassProcurementAndCCM: bypass,
         draftData: null,
         ...budgetPayload,
+        // [Plan B S29 Chunk D Mig 32] Pin V2 workflow nếu user chọn; null →
+        // BE fallback V1 auto pick.
+        approvalWorkflowId: approvalWorkflowId || null,
       })
       return res.data.id
     },
@@ -395,6 +416,29 @@ function ContractHeaderForm({
           templates={templates.data ?? []}
           typeReadonly={false}
         />
+        {/* [Plan B S29 Chunk D Mig 32] V2 workflow picker — mutually exclusive
+            với V1. Blank → BE fallback V1 auto pick (7 prod contract behavior).
+            Mirror PE PeWorkspaceCreateView pattern. */}
+        <div className="mt-4 space-y-1.5">
+          <Label>Quy trình duyệt V2 <span className="text-[10px] font-normal text-slate-400">(tùy chọn — bỏ trống = dùng V1 mặc định)</span></Label>
+          <Select
+            value={approvalWorkflowId}
+            onChange={e => setApprovalWorkflowId(e.target.value)}
+          >
+            <option value="">— V1 mặc định (auto pick) —</option>
+            {approvalWorkflows.data?.map(w => (
+              <option key={w.id} value={w.id}>
+                {w.code} v{String(w.version).padStart(2, '0')} — {w.name}
+                {w.isActive ? ' (đang áp dụng)' : ''}
+              </option>
+            ))}
+          </Select>
+          {approvalWorkflows.data && approvalWorkflows.data.length === 0 && (
+            <p className="text-[11px] text-slate-500">
+              Chưa có quy trình duyệt V2 nào được admin ghim cho HĐ — HĐ sẽ chạy theo V1 mặc định.
+            </p>
+          )}
+        </div>
         <div className="mt-4 space-y-1.5">
           <div className="flex items-center justify-between">
             <Label className="mb-0">Ngân sách (đối chiếu chi phí)</Label>

fe-admin/src/types/contracts.ts

@@ -171,4 +171,28 @@ export type ContractDetail = {
   comments: ContractComment[]
   attachments: ContractAttachment[]
   workflow: WorkflowSummary
+  // [Plan B S29 2026-05-22 Chunk E3] V2 workflow state — mirror PE pattern.
+  // Khi pin V2 (approvalWorkflowId set) → render Section 5 dynamic.
+  // V1 contract: 3 fields = null.
+  approvalWorkflowId: string | null
+  currentApprovalLevelOrder: number | null
+  levelOpinions: ContractLevelOpinion[] | null
+}
+
+// [Plan B S29 2026-05-22 Chunk E3] Mirror BE ContractLevelOpinionDto 12 fields.
+// Service ApproveV2Async UPSERT (Plan B Chunk B2). Comment empty → "(duyệt —
+// không ý kiến)". signedByUserId !== approverUserId → banner "Admin duyệt thay".
+export type ContractLevelOpinion = {
+  id: string
+  approvalWorkflowLevelId: string
+  stepOrder: number
+  stepName: string
+  levelOrder: number
+  levelName: string | null
+  approverUserId: string
+  approverFullName: string | null
+  comment: string
+  signedAt: string
+  signedByUserId: string
+  signedByFullName: string | null
 }

fe-user/src/components/contracts/ContractDetailContent.tsx

@@ -182,6 +182,47 @@ export function ContractDetailContent({
         <ContractDetailsTab contract={c} />
       </section>
 
+      {/* [Plan B S29 2026-05-22 Chunk E3] Section 5 — Ý kiến cấp duyệt V2 dynamic.
+          Mirror PE LevelOpinionsSectionV2 pattern. Chỉ render khi V2 pin
+          (approvalWorkflowId set). V1 legacy contract KHÔNG hiển thị. */}
+      {c.approvalWorkflowId && (
+        <section className="rounded-lg border border-emerald-200 bg-emerald-50/40 p-5">
+          <h2 className="mb-3 flex items-center gap-2 text-sm font-semibold text-emerald-800">
+            <ListChecks className="h-4 w-4" />
+            Ý kiến cấp duyệt (Quy trình V2)
+          </h2>
+          {(c.levelOpinions?.length ?? 0) === 0 ? (
+            <p className="text-sm text-slate-500">Chưa có ý kiến — workflow vừa bắt đầu hoặc chưa có ai duyệt.</p>
+          ) : (
+            <ul className="space-y-3">
+              {c.levelOpinions!.map(o => {
+                const adminProxy = o.signedByUserId !== o.approverUserId
+                return (
+                  <li key={o.id} className="rounded-md border border-emerald-200 bg-white p-3">
+                    <div className="mb-1 flex items-center justify-between gap-2 text-xs">
+                      <span className="font-medium text-emerald-900">
+                        Bước {o.stepOrder} {o.stepName ? `(${o.stepName})` : ''} — Cấp {o.levelOrder}
+                        {o.levelName ? ` (${o.levelName})` : ''}
+                      </span>
+                      <span className="text-slate-500">{new Date(o.signedAt).toLocaleString('vi-VN')}</span>
+                    </div>
+                    <p className="mb-1 text-sm text-slate-800">{o.comment}</p>
+                    <div className="flex flex-wrap items-center gap-2 text-xs text-slate-600">
+                      <span>NV duyệt: <strong>{o.approverFullName ?? o.approverUserId.slice(0, 8)}</strong></span>
+                      {adminProxy && (
+                        <span className="rounded bg-amber-100 px-2 py-0.5 text-amber-800">
+                          ⚡ Admin duyệt thay ({o.signedByFullName ?? o.signedByUserId.slice(0, 8)})
+                        </span>
+                      )}
+                    </div>
+                  </li>
+                )
+              })}
+            </ul>
+          )}
+        </section>
+      )}
+
       <Dialog
         open={actionOpen}
         onClose={() => setActionOpen(false)}

fe-user/src/pages/contracts/ContractCreatePage.tsx

@@ -309,6 +309,11 @@ function ContractHeaderForm({
   const [budgetManual, setBudgetManual] = useState(false)
   const [budgetManualName, setBudgetManualName] = useState('')
   const [budgetManualAmount, setBudgetManualAmount] = useState(0)
+  // [Plan B S29 Chunk D 2026-05-22 Mig 32] V2 workflow pin lúc create — mirror
+  // PE PeWorkspaceCreateView pattern. Drafter pick V2 workflow IsUserSelectable
+  // filter ApplicableType=Contract(3). Nếu blank → BE fallback V1 auto pick
+  // (7 prod contract giữ behavior cũ).
+  const [approvalWorkflowId, setApprovalWorkflowId] = useState('')
 
   // Reset type về default khi typeFilter (parent prop) thay đổi
   useEffect(() => { setType(defaultType) }, [defaultType])
@@ -327,6 +332,19 @@ function ContractHeaderForm({
     queryKey: ['templates-by-type', type],
     queryFn: async () => (await api.get<ContractTemplate[]>('/forms/templates', { params: { type } })).data,
   })
+  // [Plan B S29 Chunk D Mig 32] V2 workflows ApplicableType=Contract(3) filter
+  // IsUserSelectable=true (admin ghim cho user pick). Mirror PE Mig 25 pattern.
+  const approvalWorkflows = useQuery({
+    queryKey: ['approval-workflows-v2-contract'],
+    queryFn: async () => {
+      const res = await api.get<{ types: { applicableType: number; history: { id: string; code: string; version: number; name: string; isActive: boolean; isUserSelectable: boolean }[] }[] }>(
+        '/approval-workflows-v2',
+        { params: { applicableType: 3 } },
+      )
+      const typeBucket = res.data.types.find(t => t.applicableType === 3)
+      return (typeBucket?.history ?? []).filter(w => w.isUserSelectable)
+    },
+  })
   // Eligible Budgets: cùng Project + Phase=DaDuyet (BE-side filter).
   const eligibleBudgets = useQuery({
     queryKey: ['eligible-budgets', projectId],
@@ -357,6 +375,9 @@ function ContractHeaderForm({
         bypassProcurementAndCCM: bypass,
         draftData: null,
         ...budgetPayload,
+        // [Plan B S29 Chunk D Mig 32] Pin V2 workflow nếu user chọn; null →
+        // BE fallback V1 auto pick.
+        approvalWorkflowId: approvalWorkflowId || null,
       })
       return res.data.id
     },
@@ -395,6 +416,29 @@ function ContractHeaderForm({
           templates={templates.data ?? []}
           typeReadonly={false}
         />
+        {/* [Plan B S29 Chunk D Mig 32] V2 workflow picker — mutually exclusive
+            với V1. Blank → BE fallback V1 auto pick (7 prod contract behavior).
+            Mirror PE PeWorkspaceCreateView pattern. */}
+        <div className="mt-4 space-y-1.5">
+          <Label>Quy trình duyệt V2 <span className="text-[10px] font-normal text-slate-400">(tùy chọn — bỏ trống = dùng V1 mặc định)</span></Label>
+          <Select
+            value={approvalWorkflowId}
+            onChange={e => setApprovalWorkflowId(e.target.value)}
+          >
+            <option value="">— V1 mặc định (auto pick) —</option>
+            {approvalWorkflows.data?.map(w => (
+              <option key={w.id} value={w.id}>
+                {w.code} v{String(w.version).padStart(2, '0')} — {w.name}
+                {w.isActive ? ' (đang áp dụng)' : ''}
+              </option>
+            ))}
+          </Select>
+          {approvalWorkflows.data && approvalWorkflows.data.length === 0 && (
+            <p className="text-[11px] text-slate-500">
+              Chưa có quy trình duyệt V2 nào được admin ghim cho HĐ — HĐ sẽ chạy theo V1 mặc định.
+            </p>
+          )}
+        </div>
         <div className="mt-4 space-y-1.5">
           <div className="flex items-center justify-between">
             <Label className="mb-0">Ngân sách (đối chiếu chi phí)</Label>

fe-user/src/types/contracts.ts

@@ -171,4 +171,28 @@ export type ContractDetail = {
   comments: ContractComment[]
   attachments: ContractAttachment[]
   workflow: WorkflowSummary
+  // [Plan B S29 2026-05-22 Chunk E3] V2 workflow state — mirror PE pattern.
+  // Khi pin V2 (approvalWorkflowId set) → render Section 5 dynamic.
+  // V1 contract: 3 fields = null.
+  approvalWorkflowId: string | null
+  currentApprovalLevelOrder: number | null
+  levelOpinions: ContractLevelOpinion[] | null
+}
+
+// [Plan B S29 2026-05-22 Chunk E3] Mirror BE ContractLevelOpinionDto 12 fields.
+// Service ApproveV2Async UPSERT (Plan B Chunk B2). Comment empty → "(duyệt —
+// không ý kiến)". signedByUserId !== approverUserId → banner "Admin duyệt thay".
+export type ContractLevelOpinion = {
+  id: string
+  approvalWorkflowLevelId: string
+  stepOrder: number
+  stepName: string
+  levelOrder: number
+  levelName: string | null
+  approverUserId: string
+  approverFullName: string | null
+  comment: string
+  signedAt: string
+  signedByUserId: string
+  signedByFullName: string | null
 }

src/Backend/SolutionErp.Application/Common/Interfaces/IApplicationDbContext.cs

@@ -35,6 +35,9 @@ public interface IApplicationDbContext
     DbSet<ContractCodeSequence> ContractCodeSequences { get; }
     DbSet<ContractChangelog> ContractChangelogs { get; }
     DbSet<ContractDepartmentApproval> ContractDepartmentApprovals { get; }
+    // Plan B Chunk C (S29 — Mig 33) — Ý kiến cấp duyệt V2 dynamic cho HĐ.
+    // Cookie-cutter mirror PE Mig 26 PurchaseEvaluationLevelOpinions.
+    DbSet<ContractLevelOpinion> ContractLevelOpinions { get; }
     DbSet<Notification> Notifications { get; }
     DbSet<WorkflowTypeAssignment> WorkflowTypeAssignments { get; }
     DbSet<WorkflowDefinition> WorkflowDefinitions { get; }

src/Backend/SolutionErp.Application/Contracts/ContractFeatures.cs

@@ -27,7 +27,13 @@ public record CreateContractCommand(
     string? DraftData,
     Guid? BudgetId,
     string? BudgetManualName,
-    decimal? BudgetManualAmount) : IRequest<Guid>;
+    decimal? BudgetManualAmount,
+    // [Plan B S29 2026-05-22 Chunk E1] Drafter pick V2 workflow lúc create —
+    // mirror PE pattern Workspace Select dropdown. Nếu null → fallback V1 auto
+    // pick activeWfId (7 prod contract giữ behavior). Mutually exclusive với
+    // V1: pin V2 + V1 cùng lúc OK schema (cả 2 nullable) — Service ApproveV2Async
+    // branch ưu tiên V2 nếu cả 2 set.
+    Guid? ApprovalWorkflowId = null) : IRequest<Guid>;
 
 public class CreateContractCommandValidator : AbstractValidator<CreateContractCommand>
 {
@@ -64,6 +70,21 @@ public class CreateContractCommandHandler(
             .Select(w => (Guid?)w.Id)
             .FirstOrDefaultAsync(ct);
 
+        // [Plan B S29 2026-05-22 Hotfix Reviewer] Validate ApprovalWorkflowId V2
+        // (Mig 32) — User chọn lúc create. Phải tồn tại + ApplicableType=Contract(3).
+        // Mirror PE pattern PurchaseEvaluationFeatures.cs:62-77. Defense-in-depth:
+        // FE Workspace dropdown đã filter ApplicableType=3 server-side; BE guard
+        // chặn attacker forge POST với PE workflow ID (ApplicableType=1/2).
+        if (request.ApprovalWorkflowId is Guid awId)
+        {
+            var aw = await db.ApprovalWorkflows.AsNoTracking()
+                .FirstOrDefaultAsync(w => w.Id == awId, ct)
+                ?? throw new NotFoundException("ApprovalWorkflow", awId);
+            if (aw.ApplicableType != Domain.ApprovalWorkflowsV2.ApprovalWorkflowApplicableType.Contract)
+                throw new ConflictException(
+                    $"Quy trình {aw.Code} áp dụng cho {aw.ApplicableType}, không khớp với HĐ (cần ApplicableType=Contract).");
+        }
+
         // Validate Budget link nếu có: cùng Project + Phase=DaDuyet.
         if (request.BudgetId is Guid bid)
         {
@@ -94,6 +115,10 @@ public class CreateContractCommandHandler(
             BudgetManualName = request.BudgetManualName,
             BudgetManualAmount = request.BudgetManualAmount,
             WorkflowDefinitionId = activeWfId,
+            // [Plan B S29 2026-05-22 Chunk E1] Pin V2 workflow nếu Drafter pick
+            // qua Workspace Select dropdown (Chunk D FE). Cả 2 set ok — Service
+            // ApproveV2Async branch dispatch theo ApprovalWorkflowId trước.
+            ApprovalWorkflowId = request.ApprovalWorkflowId,
             SlaDeadline = DateTime.UtcNow.Add(workflow.GetPhaseSla(ContractPhase.DangSoanThao) ?? TimeSpan.FromDays(7)),
         };
 
@@ -235,7 +260,7 @@ public class TransitionContractCommandHandler(
             currentUser.Roles,
             request.Decision,
             request.Comment,
-            ct);
+            ct: ct);
     }
 }
 
@@ -467,6 +492,54 @@ public class GetContractQueryHandler(
             workflowPolicy = WorkflowPolicyRegistry.ForContractWithOverrides(c, workflowOverrides);
         }
 
+        // [Plan B S29 2026-05-22 Chunk E2] Load V2 LevelOpinions nếu pin ApprovalWorkflowId.
+        // JOIN ApprovalWorkflowLevel + Step + Approver User để build dynamic DTO
+        // cho FE Section 5 render dynamic theo flow shape. V1 legacy → empty list.
+        List<ContractLevelOpinionDto>? levelOpinionsDto = null;
+        if (c.ApprovalWorkflowId is Guid awIdLoad)
+        {
+            var opinions = await db.ContractLevelOpinions.AsNoTracking()
+                .Where(o => o.ContractId == c.Id)
+                .ToListAsync(ct);
+            if (opinions.Count > 0)
+            {
+                var levelIds = opinions.Select(o => o.ApprovalWorkflowLevelId).ToHashSet();
+                var levels = await db.ApprovalWorkflowLevels.AsNoTracking()
+                    .Include(l => l.Step)
+                    .Where(l => levelIds.Contains(l.Id))
+                    .ToListAsync(ct);
+                var approverUserIds = levels.Select(l => l.ApproverUserId).ToHashSet();
+                var approverNames = await userManager.Users.AsNoTracking()
+                    .Where(u => approverUserIds.Contains(u.Id))
+                    .ToDictionaryAsync(u => u.Id, u => u.FullName, ct);
+                levelOpinionsDto = opinions
+                    .Select(o =>
+                    {
+                        var level = levels.FirstOrDefault(l => l.Id == o.ApprovalWorkflowLevelId);
+                        var step = level?.Step;
+                        return new ContractLevelOpinionDto(
+                            o.Id,
+                            o.ApprovalWorkflowLevelId,
+                            StepOrder: step?.Order ?? 0,
+                            StepName: step?.Name ?? "",
+                            LevelOrder: level?.Order ?? 0,
+                            LevelName: level?.Name,
+                            ApproverUserId: level?.ApproverUserId ?? Guid.Empty,
+                            ApproverFullName: level != null && approverNames.TryGetValue(level.ApproverUserId, out var afn) ? afn : null,
+                            o.Comment ?? "",
+                            o.SignedAt,
+                            o.SignedByUserId,
+                            o.SignedByFullName);
+                    })
+                    .OrderBy(d => d.StepOrder).ThenBy(d => d.LevelOrder)
+                    .ToList();
+            }
+            else
+            {
+                levelOpinionsDto = new List<ContractLevelOpinionDto>();
+            }
+        }
+
         // Resolve user names
         var userIds = new HashSet<Guid>();
         if (c.DrafterUserId is Guid did) userIds.Add(did);
@@ -506,7 +579,11 @@ public class GetContractQueryHandler(
                     att.Id, att.FileName, att.StoragePath, att.FileSize,
                     att.ContentType, att.Purpose, att.Note, att.CreatedAt))
                 .ToList(),
-            BuildWorkflowSummary(c, workflowPolicy));
+            BuildWorkflowSummary(c, workflowPolicy),
+            // [Plan B S29 2026-05-22 Chunk E2] V2 fields
+            ApprovalWorkflowId: c.ApprovalWorkflowId,
+            CurrentApprovalLevelOrder: c.CurrentApprovalLevelOrder,
+            LevelOpinions: levelOpinionsDto);
     }
 
     // FE uses this to render next-phase buttons dynamically — no more hardcoded

src/Backend/SolutionErp.Application/Contracts/Dtos/ContractDtos.cs

@@ -46,7 +46,34 @@ public record ContractDetailDto(
     List<ContractApprovalDto> Approvals,
     List<ContractCommentDto> Comments,
     List<ContractAttachmentDto> Attachments,
-    WorkflowSummaryDto Workflow);
+    WorkflowSummaryDto Workflow,
+    // [Plan B S29 2026-05-22 Chunk E2] V2 workflow fields — mirror PE pattern.
+    // ApprovalWorkflowId pin lúc create (Mig 32). FE Section 5 detect V2 mode
+    // qua field này: nếu Guid → render dynamic LevelOpinionsSectionV2;
+    // nếu null → V1 legacy KHÔNG Section 5 V2.
+    // FE fetch ApprovalFlow shape via /api/approval-workflows-v2/{ApprovalWorkflowId}.
+    Guid? ApprovalWorkflowId = null,
+    int? CurrentApprovalLevelOrder = null,
+    List<ContractLevelOpinionDto>? LevelOpinions = null);
+
+// [Plan B S29 2026-05-22 Chunk E2] Ý kiến cấp duyệt V2 dynamic theo
+// ApprovalWorkflowLevel. Mirror PE PurchaseEvaluationLevelOpinionDto pattern.
+// Service ApproveV2Async UPSERT (Plan B Chunk B2 1f199b0). Comment empty
+// fallback "(duyệt — không ý kiến)". SignedByUserId !== Level.ApproverUserId
+// → FE show banner "Admin duyệt thay".
+public record ContractLevelOpinionDto(
+    Guid Id,
+    Guid ApprovalWorkflowLevelId,
+    int StepOrder,
+    string StepName,
+    int LevelOrder,
+    string? LevelName,
+    Guid ApproverUserId,
+    string? ApproverFullName,
+    string Comment,
+    DateTime SignedAt,
+    Guid SignedByUserId,
+    string? SignedByFullName);
 
 // Policy snapshot for the FE — lets UI render next-phase buttons dynamically
 // without hardcoding the transition map (single source of truth in BE).

src/Backend/SolutionErp.Application/Contracts/Services/IContractWorkflowService.cs

@@ -6,6 +6,9 @@ public interface IContractWorkflowService
 {
     // Kiểm tra + thực hiện transition. Throw ForbiddenException nếu không hợp lệ.
     // Tự tạo ContractApproval row + update Phase + SlaDeadline + gen mã HĐ nếu cần.
+    // [Plan B S29 2026-05-22] +skipToFinal param F2 (Mig 31): Approver scope
+    // ChoDuyet skip thẳng Cấp cuối. V2 only, V1 legacy throw nếu non-admin.
+    // Default false để KHÔNG break existing caller (ContractsController).
     Task TransitionAsync(
         Contract contract,
         ContractPhase targetPhase,
@@ -13,6 +16,7 @@ public interface IContractWorkflowService
         IReadOnlyList<string> actorRoles,
         ApprovalDecision decision,
         string? comment,
+        bool skipToFinal = false,
         CancellationToken ct = default);
 
     // SLA còn bao lâu ở phase hiện tại (seconds). Null nếu không có SLA.

src/Backend/SolutionErp.Domain/Contracts/Contract.cs

@@ -20,6 +20,7 @@ public class Contract : AuditableEntity
     public string? NoiDung { get; set; }
     public bool BypassProcurementAndCCM { get; set; }              // HĐ Chủ đầu tư → skip CCM
     public Guid? WorkflowDefinitionId { get; set; }                // Pinned at creation — HĐ cũ chạy version cũ ngay cả khi admin active version mới
+    public Guid? ApprovalWorkflowId { get; set; }                  // [Plan B S29 2026-05-22 Mig 32] Pin schema mới ApprovalWorkflowsV2 — mirror PE Mig 23. V1+V2 coexist: 7 V1 contract giữ WorkflowDefinitionId; V2 mới pin ApprovalWorkflowId. Service ApproveV2Async branch theo field này.
     public DateTime? SlaDeadline { get; set; }                     // Hết hạn phase hiện tại
     public string? DraftData { get; set; }                         // JSON field values (render template)
     public bool SlaWarningSent { get; set; }                       // Flag để không gửi warning 2 lần
@@ -39,9 +40,20 @@ public class Contract : AuditableEntity
     public int? CurrentWorkflowStepIndex { get; set; }
     public int? RejectedAtStepIndex { get; set; }
 
+    // [Plan B S29 2026-05-22 Mig 32] V2 workflow tracking — mirror PE Mig 24.
+    // CurrentApprovalLevelOrder: Cấp đang chờ duyệt (1/2/3) trong Step hiện tại
+    // khi pin ApprovalWorkflowId. Null khi V1 legacy hoặc V2 terminal (DaPhatHanh).
+    public int? CurrentApprovalLevelOrder { get; set; }
+
     public List<ContractApproval> Approvals { get; set; } = new();
     public List<ContractComment> Comments { get; set; } = new();
     public List<ContractAttachment> Attachments { get; set; } = new();
+
+    // Plan B Chunk C (S29 — Mig 33, 2026-05-22) — Ý kiến cấp duyệt V2 dynamic
+    // cookie-cutter mirror PE Mig 26. UPSERT auto từ ApproveV2Async (Plan B
+    // Chunk D em main wire). Section 5 FE render dynamic theo flow.steps[].levels[].
+    // HĐ V1 (WorkflowDefinitionId) KHÔNG dùng.
+    public List<ContractLevelOpinion> LevelOpinions { get; set; } = new();
     public List<ContractChangelog> Changelogs { get; set; } = new();
     public List<ContractDepartmentApproval> DepartmentApprovals { get; set; } = new();
 

src/Backend/SolutionErp.Domain/Contracts/ContractLevelOpinion.cs

@@ -0,0 +1,36 @@
+using SolutionErp.Domain.ApprovalWorkflowsV2;
+using SolutionErp.Domain.Common;
+
+namespace SolutionErp.Domain.Contracts;
+
+// "Ý kiến cấp duyệt" V2 cho HĐ — sign-off DYNAMIC theo workflow ApprovalWorkflowV2
+// (Mig 22-25 + Plan B Mig 32). Cookie-cutter mirror PE Mig 26
+// `PurchaseEvaluationLevelOpinion` (S19 2026-05-09).
+//
+// Mỗi row = 1 (Contract × ApprovalWorkflowLevel). Service `ApproveV2Async` sau khi
+// approve thành công Cấp hiện tại sẽ UPSERT row này (Plan B Chunk D em main wire):
+//   Comment       = approval.Comment ?? "(duyệt — không ý kiến)"
+//   SignedAt      = clock.UtcNow
+//   SignedByUserId = actor.Id  (NV chính chủ HOẶC Admin override)
+//   SignedByFullName = actor.FullName  (denorm — tránh user bị xóa/đổi tên)
+//
+// Reject (Trả lại / Từ chối) KHÔNG sync (vì không phải sign-off của level đó).
+// Khi user resubmit từ TraLai → workflow chạy lại từ Cấp 1, opinion cũ bị
+// OVERWRITE bằng UPSERT mới (latest-write-wins).
+//
+// Section 5 FE detect V2 qua `contract.approvalWorkflowId != null` → render dynamic
+// theo flow.steps[].levels[]. HĐ V1 legacy (WorkflowDefinitionId set) → fallback
+// không có ý kiến dynamic (giống PE V1 behavior).
+public class ContractLevelOpinion : AuditableEntity
+{
+    public Guid ContractId { get; set; }
+    public Guid ApprovalWorkflowLevelId { get; set; }
+
+    public string? Comment { get; set; }                // ý kiến (max 2000) hoặc placeholder "(duyệt — không ý kiến)"
+    public DateTime SignedAt { get; set; }              // luôn có khi UPSERT (Service set khi Approve)
+    public Guid SignedByUserId { get; set; }            // người ký thực sự (có thể là Admin thay NV)
+    public string SignedByFullName { get; set; } = string.Empty;  // snapshot tên — denorm
+
+    public Contract? Contract { get; set; }
+    public ApprovalWorkflowLevel? Level { get; set; }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/ApplicationDbContext.cs

@@ -37,6 +37,8 @@ public class ApplicationDbContext
     public DbSet<ContractCodeSequence> ContractCodeSequences => Set<ContractCodeSequence>();
     public DbSet<ContractChangelog> ContractChangelogs => Set<ContractChangelog>();
     public DbSet<ContractDepartmentApproval> ContractDepartmentApprovals => Set<ContractDepartmentApproval>();
+    // Plan B Chunk C (S29 — Mig 33) — Ý kiến cấp duyệt V2 cho HĐ. Mirror PE Mig 26.
+    public DbSet<ContractLevelOpinion> ContractLevelOpinions => Set<ContractLevelOpinion>();
     public DbSet<Notification> Notifications => Set<Notification>();
     public DbSet<WorkflowTypeAssignment> WorkflowTypeAssignments => Set<WorkflowTypeAssignment>();
     public DbSet<WorkflowDefinition> WorkflowDefinitions => Set<WorkflowDefinition>();

src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/ContractConfiguration.cs

@@ -28,6 +28,15 @@ public class ContractConfiguration : IEntityTypeConfiguration<Contract>
         b.HasIndex(x => x.ProjectId);
         b.HasIndex(x => x.SlaDeadline);
         b.HasIndex(x => x.BudgetId);
+        b.HasIndex(x => x.ApprovalWorkflowId);
+
+        // FK ApprovalWorkflowId Restrict (Plan B Chunk A2 — Mig 32 mirror PE Mig 23)
+        // ApprovalWorkflowsV2 pin lúc create HĐ V2. Restrict để KHÔNG xóa workflow
+        // nếu còn HĐ pin.
+        b.HasOne<SolutionErp.Domain.ApprovalWorkflowsV2.ApprovalWorkflow>()
+            .WithMany()
+            .HasForeignKey(x => x.ApprovalWorkflowId)
+            .OnDelete(DeleteBehavior.Restrict);
 
         b.HasMany(x => x.Approvals).WithOne(a => a.Contract).HasForeignKey(a => a.ContractId).OnDelete(DeleteBehavior.Cascade);
         b.HasMany(x => x.Comments).WithOne(c => c.Contract).HasForeignKey(c => c.ContractId).OnDelete(DeleteBehavior.Cascade);

src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/ContractLevelOpinionConfiguration.cs

@@ -0,0 +1,37 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using SolutionErp.Domain.Contracts;
+
+namespace SolutionErp.Infrastructure.Persistence.Configurations;
+
+// Plan B Chunk C (S29 — Mig 33, 2026-05-22) — cookie-cutter mirror
+// PurchaseEvaluationLevelOpinionConfiguration (Mig 26 S19).
+//
+// UPSERT auto sync từ ContractWorkflowService.ApproveV2Async (Plan B Chunk D em
+// main wire). UNIQUE (ContractId, ApprovalWorkflowLevelId) đảm bảo 1 row/level/HĐ.
+// FK Cascade Contract (xoá HĐ → xoá opinions),
+// FK Restrict Level (admin xoá Level chặn nếu opinion tồn tại — bảo vệ data).
+// SignedByUserId KHÔNG nav (tránh cascade khi xoá user; denorm SignedByFullName).
+public class ContractLevelOpinionConfiguration : IEntityTypeConfiguration<ContractLevelOpinion>
+{
+    public void Configure(EntityTypeBuilder<ContractLevelOpinion> e)
+    {
+        e.ToTable("ContractLevelOpinions");
+
+        e.Property(x => x.Comment).HasMaxLength(2000);
+        e.Property(x => x.SignedByFullName).HasMaxLength(200).IsRequired();
+
+        e.HasOne(x => x.Contract)
+            .WithMany(c => c.LevelOpinions)
+            .HasForeignKey(x => x.ContractId)
+            .OnDelete(DeleteBehavior.Cascade);
+
+        e.HasOne(x => x.Level)
+            .WithMany()
+            .HasForeignKey(x => x.ApprovalWorkflowLevelId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        e.HasIndex(x => new { x.ContractId, x.ApprovalWorkflowLevelId }).IsUnique();
+        e.HasIndex(x => x.ApprovalWorkflowLevelId);
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/DbInitializer.cs

@@ -68,6 +68,7 @@ public static class DbInitializer
         //   - SeedDemoContractsAsync ([DEMO] HĐ 7-type sample)
         //   - SeedDemoPurchaseEvaluationsAsync ([DEMO] PE 4 sample)
         //   - SeedSampleApprovalWorkflowsV2Async (V2 sample mẫu UAT cho type B)
+        //   - SeedSampleContractWorkflowV2Async (V2 sample mẫu UAT cho Contract — Mig 32 Plan B Chunk A2)
         // GIỮ: SeedRoles, SeedAdmin, SeedDepartments, SeedDemoUsers (30 user UAT),
         // SeedMenuTree, SeedAdminPermissions, SeedDemoMasterData (Supplier/Project
         // master), SeedContractTemplates (file template), SeedCatalogs, backfill
@@ -76,7 +77,7 @@ public static class DbInitializer
         var config = sp.GetRequiredService<IConfiguration>();
         var demoSeedDisabled = config.GetValue<bool>("DemoSeed:Disabled");
         if (demoSeedDisabled)
-            logger.LogInformation("DemoSeed:Disabled=true — skip workflow + contracts + PE + sample V2 seed (Plan T S23 t10)");
+            logger.LogInformation("DemoSeed:Disabled=true — skip workflow + contracts + PE + sample V2 seed (Plan T S23 t10 + Plan B Chunk A2 Contract V2)");
 
         await SeedRolesAsync(roleManager, logger);
         // Phase 6 rebrand: rename user email @solutionerp.local → @solutions.com.vn
@@ -106,6 +107,7 @@ public static class DbInitializer
             await SeedDemoContractsAsync(db, userManager, codeGen, logger);
             await SeedDemoPurchaseEvaluationsAsync(db, userManager, logger);
             await SeedSampleApprovalWorkflowsV2Async(db, userManager, logger);
+            await SeedSampleContractWorkflowV2Async(db, userManager, logger);
         }
 
         await WarnDefaultAdminPasswordAsync(userManager, logger);
@@ -163,6 +165,58 @@ public static class DbInitializer
         logger.LogInformation("Seeded sample ApprovalWorkflow V2 for DuyetNccPhuongAn: QT-DN-PA-V2-001 v01");
     }
 
+    // [Plan B S29 2026-05-22 Chunk A2] Seed sample workflow V2 cho ApplicableType=Contract,
+    // giúp UAT HĐ V2 nhanh không cần admin tạo qua Designer trước. Idempotent — skip
+    // nếu đã có ANY workflow Contract (admin đã tạo) HOẶC nếu thiếu user CCM seed.
+    // Mirror SeedSampleApprovalWorkflowsV2Async pattern (DuyetNccPhuongAn).
+    private static async Task SeedSampleContractWorkflowV2Async(
+        ApplicationDbContext db, UserManager<User> userManager, ILogger logger)
+    {
+        var hasAnyContract = await db.ApprovalWorkflows
+            .AnyAsync(w => w.ApplicableType == ApprovalWorkflowApplicableType.Contract);
+        if (hasAnyContract) return;
+
+        var approver = await userManager.FindByEmailAsync("binh.le@solutions.com.vn");
+        if (approver is null)
+        {
+            logger.LogWarning("SeedSampleContractWorkflowV2Async: skip — approver binh.le@solutions.com.vn (Lê Văn Bình CCM) not found");
+            return;
+        }
+
+        var ccmDept = await db.Departments.FirstOrDefaultAsync(d => d.Code == "CCM");
+
+        var wf = new ApprovalWorkflow
+        {
+            Code = "QT-HD-V2-001",
+            Version = 1,
+            ApplicableType = ApprovalWorkflowApplicableType.Contract,
+            Name = "Quy trình duyệt HĐ mẫu UAT V2",
+            Description = "Sample seed cho UAT HĐ V2 — 1 Bước Phòng CCM × 1 Cấp (Lê Văn Bình). Admin có thể clone tạo version mới qua Designer.",
+            IsActive = true,
+            IsUserSelectable = true,    // Mig 25 — user pick qua Workspace dropdown
+            ActivatedAt = DateTime.UtcNow,
+        };
+        var step = new ApprovalWorkflowStep
+        {
+            ApprovalWorkflow = wf,
+            Order = 1,
+            Name = "Bước 1 - Phòng CCM",
+            DepartmentId = ccmDept?.Id,
+        };
+        var level = new ApprovalWorkflowLevel
+        {
+            Step = step,
+            Order = 1,
+            Name = "Cấp 1",
+            ApproverUserId = approver.Id,
+        };
+        wf.Steps.Add(step);
+        step.Levels.Add(level);
+        db.ApprovalWorkflows.Add(wf);
+        await db.SaveChangesAsync();
+        logger.LogInformation("Seeded sample ApprovalWorkflow V2 for Contract: QT-HD-V2-001 v01");
+    }
+
     // Seed 4 master catalogs với defaults cho user nhập liệu Details. Idempotent:
     // skip per-table nếu đã có row (admin có thể đã thêm/sửa — không clobber).
     private static async Task SeedCatalogsAsync(ApplicationDbContext db, ILogger logger)

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/20260522051059_AddApprovalWorkflowToContract.cs

@@ -0,0 +1,60 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SolutionErp.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddApprovalWorkflowToContract : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<Guid>(
+                name: "ApprovalWorkflowId",
+                table: "Contracts",
+                type: "uniqueidentifier",
+                nullable: true);
+
+            migrationBuilder.AddColumn<int>(
+                name: "CurrentApprovalLevelOrder",
+                table: "Contracts",
+                type: "int",
+                nullable: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Contracts_ApprovalWorkflowId",
+                table: "Contracts",
+                column: "ApprovalWorkflowId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Contracts_ApprovalWorkflows_ApprovalWorkflowId",
+                table: "Contracts",
+                column: "ApprovalWorkflowId",
+                principalTable: "ApprovalWorkflows",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Contracts_ApprovalWorkflows_ApprovalWorkflowId",
+                table: "Contracts");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Contracts_ApprovalWorkflowId",
+                table: "Contracts");
+
+            migrationBuilder.DropColumn(
+                name: "ApprovalWorkflowId",
+                table: "Contracts");
+
+            migrationBuilder.DropColumn(
+                name: "CurrentApprovalLevelOrder",
+                table: "Contracts");
+        }
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/20260522052240_AddContractLevelOpinions.cs

@@ -0,0 +1,69 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SolutionErp.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddContractLevelOpinions : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "ContractLevelOpinions",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    ContractId = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    ApprovalWorkflowLevelId = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    Comment = table.Column<string>(type: "nvarchar(2000)", maxLength: 2000, nullable: true),
+                    SignedAt = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    SignedByUserId = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    SignedByFullName = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    CreatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true),
+                    UpdatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true),
+                    IsDeleted = table.Column<bool>(type: "bit", nullable: false),
+                    DeletedAt = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    DeletedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ContractLevelOpinions", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_ContractLevelOpinions_ApprovalWorkflowLevels_ApprovalWorkflowLevelId",
+                        column: x => x.ApprovalWorkflowLevelId,
+                        principalTable: "ApprovalWorkflowLevels",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_ContractLevelOpinions_Contracts_ContractId",
+                        column: x => x.ContractId,
+                        principalTable: "Contracts",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ContractLevelOpinions_ApprovalWorkflowLevelId",
+                table: "ContractLevelOpinions",
+                column: "ApprovalWorkflowLevelId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ContractLevelOpinions_ContractId_ApprovalWorkflowLevelId",
+                table: "ContractLevelOpinions",
+                columns: new[] { "ContractId", "ApprovalWorkflowLevelId" },
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "ContractLevelOpinions");
+        }
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -637,6 +637,9 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                         .ValueGeneratedOnAdd()
                         .HasColumnType("uniqueidentifier");
 
+                    b.Property<Guid?>("ApprovalWorkflowId")
+                        .HasColumnType("uniqueidentifier");
+
                     b.Property<Guid?>("BudgetId")
                         .HasColumnType("uniqueidentifier");
 
@@ -657,6 +660,9 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                     b.Property<Guid?>("CreatedBy")
                         .HasColumnType("uniqueidentifier");
 
+                    b.Property<int?>("CurrentApprovalLevelOrder")
+                        .HasColumnType("int");
+
                     b.Property<int?>("CurrentWorkflowStepIndex")
                         .HasColumnType("int");
 
@@ -732,6 +738,8 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
 
                     b.HasKey("Id");
 
+                    b.HasIndex("ApprovalWorkflowId");
+
                     b.HasIndex("BudgetId");
 
                     b.HasIndex("MaHopDong")
@@ -1036,6 +1044,64 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                     b.ToTable("ContractDepartmentApprovals", (string)null);
                 });
 
+            modelBuilder.Entity("SolutionErp.Domain.Contracts.ContractLevelOpinion", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<Guid>("ApprovalWorkflowLevelId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Comment")
+                        .HasMaxLength(2000)
+                        .HasColumnType("nvarchar(2000)");
+
+                    b.Property<Guid>("ContractId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("CreatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime?>("DeletedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("DeletedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<bool>("IsDeleted")
+                        .HasColumnType("bit");
+
+                    b.Property<DateTime>("SignedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<string>("SignedByFullName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<Guid>("SignedByUserId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("UpdatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ApprovalWorkflowLevelId");
+
+                    b.HasIndex("ContractId", "ApprovalWorkflowLevelId")
+                        .IsUnique();
+
+                    b.ToTable("ContractLevelOpinions", (string)null);
+                });
+
             modelBuilder.Entity("SolutionErp.Domain.Contracts.Details.DichVuDetail", b =>
                 {
                     b.Property<Guid>("Id")
@@ -3479,6 +3545,14 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                     b.Navigation("Budget");
                 });
 
+            modelBuilder.Entity("SolutionErp.Domain.Contracts.Contract", b =>
+                {
+                    b.HasOne("SolutionErp.Domain.ApprovalWorkflowsV2.ApprovalWorkflow", null)
+                        .WithMany()
+                        .HasForeignKey("ApprovalWorkflowId")
+                        .OnDelete(DeleteBehavior.Restrict);
+                });
+
             modelBuilder.Entity("SolutionErp.Domain.Contracts.ContractApproval", b =>
                 {
                     b.HasOne("SolutionErp.Domain.Contracts.Contract", "Contract")
@@ -3534,6 +3608,25 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                     b.Navigation("Contract");
                 });
 
+            modelBuilder.Entity("SolutionErp.Domain.Contracts.ContractLevelOpinion", b =>
+                {
+                    b.HasOne("SolutionErp.Domain.ApprovalWorkflowsV2.ApprovalWorkflowLevel", "Level")
+                        .WithMany()
+                        .HasForeignKey("ApprovalWorkflowLevelId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("SolutionErp.Domain.Contracts.Contract", "Contract")
+                        .WithMany("LevelOpinions")
+                        .HasForeignKey("ContractId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Contract");
+
+                    b.Navigation("Level");
+                });
+
             modelBuilder.Entity("SolutionErp.Domain.Contracts.Details.DichVuDetail", b =>
                 {
                     b.HasOne("SolutionErp.Domain.Contracts.Contract", "Contract")
@@ -3866,6 +3959,8 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
 
                     b.Navigation("GiaoKhoanDetails");
 
+                    b.Navigation("LevelOpinions");
+
                     b.Navigation("MuaBanDetails");
 
                     b.Navigation("NguyenTacDvDetails");

src/Backend/SolutionErp.Infrastructure/Services/ContractWorkflowService.cs

@@ -38,6 +38,7 @@ public class ContractWorkflowService(
         IReadOnlyList<string> actorRoles,
         ApprovalDecision decision,
         string? comment,
+        bool skipToFinal = false,
         CancellationToken ct = default)
     {
         var fromPhase = contract.Phase;
@@ -78,6 +79,9 @@ public class ContractWorkflowService(
             }
             contract.Phase = ContractPhase.ChoDuyet;
             contract.CurrentWorkflowStepIndex = 0;
+            // [Plan B S29 2026-05-22] V2 pointer init — mirror PE line 153.
+            // Chỉ init levelOrder=1 nếu pin schema V2 (ApprovalWorkflowId set).
+            contract.CurrentApprovalLevelOrder = contract.ApprovalWorkflowId is not null ? 1 : null;
             contract.SlaDeadline = dateTime.UtcNow.AddDays(7);
             await LogTransitionAsync(contract, fromPhase, ContractPhase.ChoDuyet, actorUserId, decision, comment, ct);
             await db.SaveChangesAsync(ct);
@@ -87,6 +91,20 @@ public class ContractWorkflowService(
         // ===== APPROVE STEP =====
         if (fromPhase == ContractPhase.ChoDuyet && decision == ApprovalDecision.Approve)
         {
+            // [Plan B S29 2026-05-22] Branch V2 schema mới (ApprovalWorkflowId pin)
+            // vs V1 legacy (WorkflowDefinitionId pin Mig 21). Mirror PE
+            // PurchaseEvaluationWorkflowService.cs line 161-180 pattern.
+            // V1 legacy giữ behavior cũ — 7 prod contract chạy nhánh này.
+            if (contract.ApprovalWorkflowId is Guid awId)
+            {
+                await ApproveV2Async(contract, awId, actorUserId, actorRoles, isAdmin, isSystem, comment, skipToFinal, ct);
+                await db.SaveChangesAsync(ct);
+                return;
+            }
+            if (skipToFinal && !isAdmin && !isSystem)
+                throw new ConflictException(
+                    "skipToFinal chỉ hỗ trợ HĐ V2 (ApprovalWorkflowsV2). HĐ V1 legacy không có per-Approver-slot flag.");
+
             var def = contract.WorkflowDefinitionId is Guid wfId
                 ? await db.WorkflowDefinitions.AsNoTracking()
                     .Include(d => d.Steps.OrderBy(s => s.Order))
@@ -183,6 +201,198 @@ public class ContractWorkflowService(
         throw new ConflictException($"Transition {fromPhase} → {targetPhase} không hỗ trợ.");
     }
 
+    // ===== V2 APPROVE (Mig 32+33 — Plan B S29 2026-05-22) =====
+    // Mirror PurchaseEvaluationWorkflowService.cs:ApproveV2Async (line 446-634).
+    // Khác PE: terminal hoàn tất → gen mã HĐ + Phase=DaPhatHanh (PE chỉ
+    // Phase=DaDuyet, không gen mã). V1 legacy giữ behavior cũ.
+    //
+    // skipToFinal F2 (Mig 31 Plan K S23): Approver tick "Duyệt thẳng Cấp cuối"
+    // + admin opt-in per slot tại matchingLevel.AllowApproverSkipToFinal → bỏ
+    // qua mọi Bước/Cấp trung gian, advance pointer tới Bước cuối + Cấp cuối.
+    // Phase giữ ChoDuyet — NV cuối vẫn duyệt thật để tiến DaPhatHanh.
+    //
+    // TODO Chunk C: UPSERT ContractLevelOpinion (table chưa tồn tại — Mig 33
+    // sẽ scaffold + entity + EF config). Sau Chunk C done, em main add block
+    // UPSERT mirror PE line 512-546.
+    private async Task ApproveV2Async(
+        Contract contract,
+        Guid awId,
+        Guid? actorUserId,
+        IReadOnlyList<string> actorRoles,
+        bool isAdmin,
+        bool isSystem,
+        string? comment,
+        bool skipToFinal,
+        CancellationToken ct)
+    {
+        var aw = await db.ApprovalWorkflows.AsNoTracking()
+            .Include(w => w.Steps.OrderBy(s => s.Order))
+                .ThenInclude(s => s.Levels.OrderBy(l => l.Order))
+            .FirstOrDefaultAsync(w => w.Id == awId, ct)
+            ?? throw new ConflictException($"ApprovalWorkflow {awId} không tồn tại.");
+
+        var steps = aw.Steps.OrderBy(s => s.Order).ToList();
+        if (steps.Count == 0)
+            throw new ConflictException("Quy trình chưa có bước nào.");
+
+        var currentIdx = contract.CurrentWorkflowStepIndex ?? 0;
+        if (currentIdx < 0 || currentIdx >= steps.Count)
+            throw new ConflictException($"CurrentWorkflowStepIndex={currentIdx} không hợp lệ (max={steps.Count - 1}).");
+
+        var currentLevelOrder = contract.CurrentApprovalLevelOrder ?? 1;
+        var currentStep = steps[currentIdx];
+
+        // Group levels by Order = Cấp. Mỗi Cấp có N approvers (OR-of-N).
+        var levelGroups = currentStep.Levels.OrderBy(l => l.Order).GroupBy(l => l.Order).ToList();
+        var maxLevelOrder = levelGroups.Count == 0 ? 0 : levelGroups.Max(g => g.Key);
+        if (currentLevelOrder < 1 || currentLevelOrder > maxLevelOrder)
+            throw new ConflictException($"CurrentApprovalLevelOrder={currentLevelOrder} không hợp lệ (max={maxLevelOrder}).");
+
+        var pendingLevelGroup = levelGroups.FirstOrDefault(g => g.Key == currentLevelOrder)
+            ?? throw new ConflictException($"Bước {currentIdx + 1} không có cấp {currentLevelOrder}.");
+
+        // Match approver: actor.Id ∈ pendingLevelGroup.ApproverUserId. Admin bypass.
+        if (!isAdmin && !isSystem)
+        {
+            if (actorUserId is null)
+                throw new ForbiddenException("Không xác định được approver.");
+            var allowedUserIds = pendingLevelGroup.Select(l => l.ApproverUserId).ToHashSet();
+            if (!allowedUserIds.Contains(actorUserId.Value))
+            {
+                var names = string.Join(", ", allowedUserIds);
+                throw new ForbiddenException(
+                    $"Bước {currentIdx + 1} ({currentStep.Name}) — Cấp {currentLevelOrder}: bạn không có trong danh sách NV duyệt ({names}).");
+            }
+        }
+
+        // Log approval. Enrich comment với prefix "[Duyệt vượt cấp]" khi
+        // skipToFinal=true (mirror PE Plan AC S25 Bug 3b).
+        var skipPrefix = skipToFinal ? "[Duyệt vượt cấp tới Cấp cuối] " : "";
+        db.ContractApprovals.Add(new ContractApproval
+        {
+            ContractId = contract.Id,
+            FromPhase = contract.Phase,
+            ToPhase = contract.Phase,
+            ApproverUserId = actorUserId,
+            Decision = ApprovalDecision.Approve,
+            Comment = $"{skipPrefix}[Bước {currentIdx + 1} — Cấp {currentLevelOrder}] {comment ?? ""}".Trim(),
+            ApprovedAt = dateTime.UtcNow,
+        });
+
+        // [Plan B Chunk B2 S29 2026-05-22] UPSERT ContractLevelOpinion vào row
+        // Level chính chủ (mirror PE Mig 26 line 512-546). Section 5 FE render
+        // dynamic theo flow.steps[].levels[]. Comment khi duyệt auto sync sang
+        // Section 5 (read-only summary). Empty comment → "(duyệt — không ý kiến)"
+        // placeholder. Multi-NV cùng Cấp (OR-of-N): match level theo
+        // ApproverUserId. Admin override → fallback first level group; FE detect
+        // SignedByUserId !== Level.ApproverUserId → banner "Admin duyệt thay".
+        var matchingLevel = pendingLevelGroup.FirstOrDefault(l => actorUserId.HasValue && l.ApproverUserId == actorUserId.Value)
+                            ?? pendingLevelGroup.First();
+        var actorFullName = await ResolveActorFullNameAsync(actorUserId, isSystem, ct);
+        var existingOpinion = await db.ContractLevelOpinions
+            .FirstOrDefaultAsync(o => o.ContractId == contract.Id
+                && o.ApprovalWorkflowLevelId == matchingLevel.Id, ct);
+        var normalizedComment = string.IsNullOrWhiteSpace(comment)
+            ? "(duyệt — không ý kiến)"
+            : comment.Trim();
+        if (existingOpinion is null)
+        {
+            db.ContractLevelOpinions.Add(new ContractLevelOpinion
+            {
+                ContractId = contract.Id,
+                ApprovalWorkflowLevelId = matchingLevel.Id,
+                Comment = normalizedComment,
+                SignedAt = dateTime.UtcNow,
+                SignedByUserId = actorUserId ?? Guid.Empty,
+                SignedByFullName = actorFullName,
+            });
+        }
+        else
+        {
+            existingOpinion.Comment = normalizedComment;
+            existingOpinion.SignedAt = dateTime.UtcNow;
+            existingOpinion.SignedByUserId = actorUserId ?? Guid.Empty;
+            existingOpinion.SignedByFullName = actorFullName;
+        }
+
+        // skipToFinal F2 (Mig 31 Plan K S23) — Approver scope ChoDuyet skip
+        // thẳng Cấp cuối. Admin opt-in per slot tại AllowApproverSkipToFinal.
+        if (skipToFinal)
+        {
+            if (!isAdmin && !isSystem && !matchingLevel.AllowApproverSkipToFinal)
+            {
+                throw new ConflictException(
+                    $"Cấp Approver hiện tại (Bước {currentIdx + 1} Cấp {currentLevelOrder}) " +
+                    "chưa được phép duyệt thẳng Cấp cuối. Admin phải tick checkbox " +
+                    "'Duyệt thẳng Cấp cuối' trong Workflow Designer cho slot này.");
+            }
+
+            var lastStepIdx = steps.Count - 1;
+            var lastStep = steps[lastStepIdx];
+            var lastLevelGroups = lastStep.Levels.OrderBy(l => l.Order).GroupBy(l => l.Order).ToList();
+            var lastLevelMaxOrder = lastLevelGroups.Count == 0 ? 1 : lastLevelGroups.Max(g => g.Key);
+
+            // Guard: actor đã ở Cấp cuối Bước cuối → fall through normal advance
+            // (sẽ hit branch nextIdx >= steps.Count → DaPhatHanh đúng).
+            if (!(currentIdx == lastStepIdx && currentLevelOrder == lastLevelMaxOrder))
+            {
+                contract.CurrentWorkflowStepIndex = lastStepIdx;
+                contract.CurrentApprovalLevelOrder = lastLevelMaxOrder;
+                contract.SlaDeadline = dateTime.UtcNow.AddDays(7);
+                await LogTransitionAsync(
+                    contract,
+                    ContractPhase.ChoDuyet,
+                    ContractPhase.ChoDuyet,
+                    actorUserId,
+                    ApprovalDecision.Approve,
+                    $"[Approver skip thẳng tới Bước {lastStepIdx + 1} Cấp {lastLevelMaxOrder} (NV cuối) — bỏ qua các Bước/Cấp trung gian] {comment ?? ""}".Trim(),
+                    ct);
+                return;
+            }
+        }
+
+        // Advance: nếu còn cấp tiếp trong Step → levelOrder++; else → next Step + level 1
+        if (currentLevelOrder < maxLevelOrder)
+        {
+            contract.CurrentApprovalLevelOrder = currentLevelOrder + 1;
+            contract.SlaDeadline = dateTime.UtcNow.AddDays(7);
+            await LogTransitionAsync(contract, contract.Phase, contract.Phase, actorUserId, ApprovalDecision.Approve,
+                $"Hoàn tất Cấp {currentLevelOrder}, sang Cấp {currentLevelOrder + 1} cùng Bước {currentIdx + 1}", ct);
+            return;
+        }
+
+        // Hết cấp trong Step — sang Step kế (Cấp 1)
+        var nextIdx = currentIdx + 1;
+        if (nextIdx >= steps.Count)
+        {
+            // All Steps done — terminal DaPhatHanh. Khác PE: phải gen mã HĐ
+            // theo RG-001 (mirror V1 line 148-155). FE sau khi nhận DaPhatHanh
+            // sẽ refresh hiển thị MaHopDong.
+            if (string.IsNullOrEmpty(contract.MaHopDong))
+            {
+                var supplier = await db.Suppliers.FirstOrDefaultAsync(s => s.Id == contract.SupplierId, ct)
+                    ?? throw new NotFoundException("Supplier", contract.SupplierId);
+                var project = await db.Projects.FirstOrDefaultAsync(p => p.Id == contract.ProjectId, ct)
+                    ?? throw new NotFoundException("Project", contract.ProjectId);
+                contract.MaHopDong = await codeGenerator.GenerateAsync(contract, project.Code, supplier.Code, ct);
+            }
+            contract.Phase = ContractPhase.DaPhatHanh;
+            contract.CurrentWorkflowStepIndex = null;
+            contract.CurrentApprovalLevelOrder = null;
+            contract.SlaDeadline = null;
+            await LogTransitionAsync(contract, ContractPhase.ChoDuyet, ContractPhase.DaPhatHanh,
+                actorUserId, ApprovalDecision.Approve, comment, ct);
+        }
+        else
+        {
+            contract.CurrentWorkflowStepIndex = nextIdx;
+            contract.CurrentApprovalLevelOrder = 1;
+            contract.SlaDeadline = dateTime.UtcNow.AddDays(7);
+            await LogTransitionAsync(contract, contract.Phase, contract.Phase, actorUserId, ApprovalDecision.Approve,
+                $"Hoàn tất Bước {currentIdx + 1}/{steps.Count}, sang Bước {nextIdx + 1} (Cấp 1)", ct);
+        }
+    }
+
     private async Task LogTransitionAsync(
         Contract contract,
         ContractPhase fromPhase,
@@ -216,4 +426,18 @@ public class ContractWorkflowService(
                 ct: ct);
         }
     }
+
+    // [Plan B Chunk B2 S29 2026-05-22] Resolve actor full name for
+    // ContractLevelOpinion.SignedByFullName denormalized field (Section 5 FE
+    // display). Mirror PE PurchaseEvaluationWorkflowService.cs:774-783.
+    private async Task<string> ResolveActorFullNameAsync(Guid? actorUserId, bool isSystem, CancellationToken ct)
+    {
+        if (isSystem || actorUserId is null) return "(System)";
+        var user = await db.Users.AsNoTracking()
+            .Where(u => u.Id == actorUserId.Value)
+            .Select(u => new { u.FullName, u.UserName })
+            .FirstOrDefaultAsync(ct);
+        if (user is null) return "(unknown)";
+        return !string.IsNullOrWhiteSpace(user.FullName) ? user.FullName : (user.UserName ?? "(unknown)");
+    }
 }