diff --git a/fe-admin/src/components/pe/PeDetailTabs.tsx b/fe-admin/src/components/pe/PeDetailTabs.tsx
index 55173e5..2b72382 100644
--- a/fe-admin/src/components/pe/PeDetailTabs.tsx
+++ b/fe-admin/src/components/pe/PeDetailTabs.tsx
@@ -974,9 +974,13 @@ function BudgetAdjustSection({ ev, readOnly }: { ev: PeDetailBundle; readOnly: b
   const isDrafter = currentUser?.id != null && ev.drafterUserId === currentUser.id
   const isDrafterPhase = ev.phase === PurchaseEvaluationPhase.DangSoanThao
     || ev.phase === PurchaseEvaluationPhase.TraLai
-  // Approver currentLevel match — phase ChoDuyet + actor in current approval level
+  // F4 Approver scope (Mig 30): phase ChoDuyet + actor in currentApproval.approvers
+  // + currentLevel có flag AllowApproverEditBudget=true (admin Designer tick per slot).
   const actorInCurrentLevel = ev.currentApproval?.approvers?.some(a => a.userId === currentUser?.id) ?? false
-  const isApproverChoDuyet = ev.phase === PurchaseEvaluationPhase.ChoDuyet && actorInCurrentLevel
+  const approverEditBudgetAllowed = ev.currentLevelOptions?.allowApproverEditBudget ?? false
+  const isApproverChoDuyet = ev.phase === PurchaseEvaluationPhase.ChoDuyet
+    && actorInCurrentLevel
+    && approverEditBudgetAllowed
 
   const canAdjust = !readOnly && (isAdmin || (isDrafter && isDrafterPhase) || isApproverChoDuyet)
 
diff --git a/fe-admin/src/pages/system/ApprovalWorkflowsV2Page.tsx b/fe-admin/src/pages/system/ApprovalWorkflowsV2Page.tsx
index fae853d..6db2ead 100644
--- a/fe-admin/src/pages/system/ApprovalWorkflowsV2Page.tsx
+++ b/fe-admin/src/pages/system/ApprovalWorkflowsV2Page.tsx
@@ -42,11 +42,13 @@ type LevelDto = {
   approverUserName: string | null
   approverEmail: string | null
   // Mig 29 (S21 t5) — 5 Allow* options per slot Approver
+  // Mig 30 (S22+5) — +AllowApproverEditBudget cho Section ngân sách
   allowReturnOneLevel: boolean
   allowReturnOneStep: boolean
   allowReturnToAssignee: boolean
   allowReturnToDrafter: boolean
   allowApproverEditDetails: boolean
+  allowApproverEditBudget: boolean
 }
 type StepDto = {
   id: string
@@ -86,11 +88,13 @@ type EditLevelEntry = {
   approverUserId: string
   // Mig 29 (S21 t5) — 5 Allow* per slot (default backward compat S17: chỉ
   // AllowReturnToDrafter=true, 4 còn lại false).
+  // Mig 30 (S22+5) — +AllowApproverEditBudget cho Section ngân sách (default false).
   allowReturnOneLevel: boolean
   allowReturnOneStep: boolean
   allowReturnToAssignee: boolean
   allowReturnToDrafter: boolean
   allowApproverEditDetails: boolean
+  allowApproverEditBudget: boolean
 }
 type EditStep = { name: string; departmentId: string | null; levelEntries: EditLevelEntry[] }
 
@@ -137,6 +141,7 @@ function copyFromDefinition(d: DefinitionDto): EditStep[] {
         allowReturnToAssignee: l.allowReturnToAssignee ?? false,
         allowReturnToDrafter: l.allowReturnToDrafter ?? true,
         allowApproverEditDetails: l.allowApproverEditDetails ?? false,
+        allowApproverEditBudget: l.allowApproverEditBudget ?? false,
       })),
   }))
 }
@@ -152,6 +157,7 @@ function makeDefaultLevelEntry(order: LevelOrder, approverUserId: string): EditL
     allowReturnToAssignee: false,
     allowReturnToDrafter: true,
     allowApproverEditDetails: false,
+    allowApproverEditBudget: false,
   }
 }
 
@@ -553,6 +559,7 @@ function Designer({
             allowReturnToAssignee: e.allowReturnToAssignee,
             allowReturnToDrafter: e.allowReturnToDrafter,
             allowApproverEditDetails: e.allowApproverEditDetails,
+            allowApproverEditBudget: e.allowApproverEditBudget,
           })),
         })),
       })
@@ -911,6 +918,15 @@ function Designer({
                                     />
                                     <span>Cho phép chỉnh sửa Section 2 (Hạng mục/NCC/Báo giá) lúc đang duyệt</span>
                                   </label>
+                                  <label className="col-span-2 flex items-center gap-1 text-[11px] text-slate-700">
+                                    <input
+                                      type="checkbox"
+                                      className="h-3 w-3"
+                                      checked={entry.allowApproverEditBudget}
+                                      onChange={e => updateField('allowApproverEditBudget', e.target.checked)}
+                                    />
+                                    <span>Cho phép chỉnh sửa Section ngân sách lúc đang duyệt</span>
+                                  </label>
                                 </div>
                               </div>
                             )
diff --git a/fe-admin/src/types/purchaseEvaluation.ts b/fe-admin/src/types/purchaseEvaluation.ts
index 2c1d81e..15c7a98 100644
--- a/fe-admin/src/types/purchaseEvaluation.ts
+++ b/fe-admin/src/types/purchaseEvaluation.ts
@@ -355,6 +355,7 @@ export type ApprovalWorkflowOptions = {
   allowReturnToAssignee: boolean
   allowReturnToDrafter: boolean
   allowApproverEditDetails: boolean
+  allowApproverEditBudget: boolean   // Mig 30 (S22+5) — F4 Section ngân sách
 }
 
 // Mig 28 (S21 t4) — F1 mode Trả lại payload gửi BE
diff --git a/fe-user/src/components/pe/PeDetailTabs.tsx b/fe-user/src/components/pe/PeDetailTabs.tsx
index b2891d7..6756cb5 100644
--- a/fe-user/src/components/pe/PeDetailTabs.tsx
+++ b/fe-user/src/components/pe/PeDetailTabs.tsx
@@ -981,8 +981,12 @@ function BudgetAdjustSection({ ev, readOnly }: { ev: PeDetailBundle; readOnly: b
   const isDrafter = currentUser?.id != null && ev.drafterUserId === currentUser.id
   const isDrafterPhase = ev.phase === PurchaseEvaluationPhase.DangSoanThao
     || ev.phase === PurchaseEvaluationPhase.TraLai
+  // F4 Approver scope (Mig 30): ChoDuyet + actor in approvers + flag tick.
   const actorInCurrentLevel = ev.currentApproval?.approvers?.some(a => a.userId === currentUser?.id) ?? false
-  const isApproverChoDuyet = ev.phase === PurchaseEvaluationPhase.ChoDuyet && actorInCurrentLevel
+  const approverEditBudgetAllowed = ev.currentLevelOptions?.allowApproverEditBudget ?? false
+  const isApproverChoDuyet = ev.phase === PurchaseEvaluationPhase.ChoDuyet
+    && actorInCurrentLevel
+    && approverEditBudgetAllowed
 
   const canAdjust = !readOnly && (isAdmin || (isDrafter && isDrafterPhase) || isApproverChoDuyet)
 
diff --git a/fe-user/src/types/purchaseEvaluation.ts b/fe-user/src/types/purchaseEvaluation.ts
index e18fbca..fa922f4 100644
--- a/fe-user/src/types/purchaseEvaluation.ts
+++ b/fe-user/src/types/purchaseEvaluation.ts
@@ -353,6 +353,7 @@ export type ApprovalWorkflowOptions = {
   allowReturnToAssignee: boolean
   allowReturnToDrafter: boolean
   allowApproverEditDetails: boolean
+  allowApproverEditBudget: boolean   // Mig 30 (S22+5) — F4 Section ngân sách
 }
 
 // Mig 28 (S21 t4) — F1 mode Trả lại payload gửi BE