diff --git a/src/Backend/SolutionErp.Application/Contracts/ContractFeatures.cs b/src/Backend/SolutionErp.Application/Contracts/ContractFeatures.cs
index 714d2ce..4088ac7 100644
--- a/src/Backend/SolutionErp.Application/Contracts/ContractFeatures.cs
+++ b/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>
 {
@@ -94,6 +100,10 @@ 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)),
         };