diff --git a/fe-admin/src/components/pe/PeDetailTabs.tsx b/fe-admin/src/components/pe/PeDetailTabs.tsx
index e73669b..b642435 100644
--- a/fe-admin/src/components/pe/PeDetailTabs.tsx
+++ b/fe-admin/src/components/pe/PeDetailTabs.tsx
@@ -1999,29 +1999,48 @@ function QuoteDialog({
 }
 
 // ===== Tab: Duyệt =====
+// Plan AC S25 Bug 3 — Decision badge phân biệt Approve / Trả lại / Từ chối.
+// 3/4 mode Trả lại (OneLevel/OneStep/Assignee) giữ Phase=ChoDuyet → fromPhase
+// + toPhase badge giống hệt Approve. Decision badge bù visual phân biệt.
+const PE_DECISION_REJECT = 2
+function decisionBadge(decision: number, toPhase: number): { label: string; cls: string } {
+  if (decision === PE_DECISION_REJECT) {
+    // Reject phân biệt: TuChoi(99) = "Từ chối" / TraLai(98) hoặc ChoDuyet(10) = "Trả lại"
+    if (toPhase === 99) return { label: 'Từ chối', cls: 'bg-rose-100 text-rose-700 border border-rose-200' }
+    return { label: 'Trả lại', cls: 'bg-amber-100 text-amber-700 border border-amber-200' }
+  }
+  return { label: 'Duyệt', cls: 'bg-emerald-100 text-emerald-700 border border-emerald-200' }
+}
+
 function ApprovalsTab({ ev }: { ev: PeDetailBundle }) {
   if (ev.approvals.length === 0) return <p className="text-sm text-slate-500">Chưa có bước duyệt nào.</p>
   return (
     <ol className="space-y-2">
-      {ev.approvals.map(a => (
-        <li key={a.id} className="rounded border border-slate-200 bg-white p-3 text-sm">
-          <div className="flex items-center justify-between">
-            <div>
-              <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.fromPhase])}>
-                {PurchaseEvaluationPhaseLabel[a.fromPhase]}
-              </span>
-              <span className="mx-2">→</span>
-              <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.toPhase])}>
-                {PurchaseEvaluationPhaseLabel[a.toPhase]}
-              </span>
+      {ev.approvals.map(a => {
+        const dec = decisionBadge(a.decision, a.toPhase)
+        return (
+          <li key={a.id} className="rounded border border-slate-200 bg-white p-3 text-sm">
+            <div className="flex items-center justify-between">
+              <div className="flex items-center gap-2">
+                <span className={cn('rounded px-1.5 py-0.5 text-[11px] font-medium', dec.cls)}>
+                  {dec.label}
+                </span>
+                <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.fromPhase])}>
+                  {PurchaseEvaluationPhaseLabel[a.fromPhase]}
+                </span>
+                <span className="text-slate-400">→</span>
+                <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.toPhase])}>
+                  {PurchaseEvaluationPhaseLabel[a.toPhase]}
+                </span>
+              </div>
+              <span className="text-xs text-slate-500">{new Date(a.approvedAt).toLocaleString('vi-VN')}</span>
             </div>
-            <span className="text-xs text-slate-500">{new Date(a.approvedAt).toLocaleString('vi-VN')}</span>
-          </div>
-          <div className="mt-1 text-xs text-slate-500">
-            {a.approverName ?? 'Hệ thống'}{a.comment && ` · ${a.comment}`}
-          </div>
-        </li>
-      ))}
+            <div className="mt-1 text-xs text-slate-500">
+              {a.approverName ?? 'Hệ thống'}{a.comment && ` · ${a.comment}`}
+            </div>
+          </li>
+        )
+      })}
     </ol>
   )
 }
diff --git a/fe-user/src/components/pe/PeDetailTabs.tsx b/fe-user/src/components/pe/PeDetailTabs.tsx
index 4413698..84a22cf 100644
--- a/fe-user/src/components/pe/PeDetailTabs.tsx
+++ b/fe-user/src/components/pe/PeDetailTabs.tsx
@@ -1993,29 +1993,48 @@ function QuoteDialog({
 }
 
 // ===== Tab: Duyệt =====
+// Plan AC S25 Bug 3 — Decision badge phân biệt Approve / Trả lại / Từ chối.
+// 3/4 mode Trả lại (OneLevel/OneStep/Assignee) giữ Phase=ChoDuyet → fromPhase
+// + toPhase badge giống hệt Approve. Decision badge bù visual phân biệt.
+const PE_DECISION_REJECT = 2
+function decisionBadge(decision: number, toPhase: number): { label: string; cls: string } {
+  if (decision === PE_DECISION_REJECT) {
+    // Reject phân biệt: TuChoi(99) = "Từ chối" / TraLai(98) hoặc ChoDuyet(10) = "Trả lại"
+    if (toPhase === 99) return { label: 'Từ chối', cls: 'bg-rose-100 text-rose-700 border border-rose-200' }
+    return { label: 'Trả lại', cls: 'bg-amber-100 text-amber-700 border border-amber-200' }
+  }
+  return { label: 'Duyệt', cls: 'bg-emerald-100 text-emerald-700 border border-emerald-200' }
+}
+
 function ApprovalsTab({ ev }: { ev: PeDetailBundle }) {
   if (ev.approvals.length === 0) return <p className="text-sm text-slate-500">Chưa có bước duyệt nào.</p>
   return (
     <ol className="space-y-2">
-      {ev.approvals.map(a => (
-        <li key={a.id} className="rounded border border-slate-200 bg-white p-3 text-sm">
-          <div className="flex items-center justify-between">
-            <div>
-              <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.fromPhase])}>
-                {PurchaseEvaluationPhaseLabel[a.fromPhase]}
-              </span>
-              <span className="mx-2">→</span>
-              <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.toPhase])}>
-                {PurchaseEvaluationPhaseLabel[a.toPhase]}
-              </span>
+      {ev.approvals.map(a => {
+        const dec = decisionBadge(a.decision, a.toPhase)
+        return (
+          <li key={a.id} className="rounded border border-slate-200 bg-white p-3 text-sm">
+            <div className="flex items-center justify-between">
+              <div className="flex items-center gap-2">
+                <span className={cn('rounded px-1.5 py-0.5 text-[11px] font-medium', dec.cls)}>
+                  {dec.label}
+                </span>
+                <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.fromPhase])}>
+                  {PurchaseEvaluationPhaseLabel[a.fromPhase]}
+                </span>
+                <span className="text-slate-400">→</span>
+                <span className={cn('rounded px-1.5 py-0.5 text-[11px]', PurchaseEvaluationPhaseColor[a.toPhase])}>
+                  {PurchaseEvaluationPhaseLabel[a.toPhase]}
+                </span>
+              </div>
+              <span className="text-xs text-slate-500">{new Date(a.approvedAt).toLocaleString('vi-VN')}</span>
             </div>
-            <span className="text-xs text-slate-500">{new Date(a.approvedAt).toLocaleString('vi-VN')}</span>
-          </div>
-          <div className="mt-1 text-xs text-slate-500">
-            {a.approverName ?? 'Hệ thống'}{a.comment && ` · ${a.comment}`}
-          </div>
-        </li>
-      ))}
+            <div className="mt-1 text-xs text-slate-500">
+              {a.approverName ?? 'Hệ thống'}{a.comment && ` · ${a.comment}`}
+            </div>
+          </li>
+        )
+      })}
     </ol>
   )
 }
diff --git a/src/Backend/SolutionErp.Infrastructure/Services/PurchaseEvaluationWorkflowService.cs b/src/Backend/SolutionErp.Infrastructure/Services/PurchaseEvaluationWorkflowService.cs
index 361b896..5fad08b 100644
--- a/src/Backend/SolutionErp.Infrastructure/Services/PurchaseEvaluationWorkflowService.cs
+++ b/src/Backend/SolutionErp.Infrastructure/Services/PurchaseEvaluationWorkflowService.cs
@@ -80,6 +80,13 @@ public class PurchaseEvaluationWorkflowService(
             // guard tránh request forge non-approver gọi PATCH direct.
             await EnsureCanRejectV2Async(evaluation, actorUserId, isAdmin, ct);
 
+            // Plan AC S25 Bug 3a — capture pre-call Step/Level để log Approval row
+            // chính xác (ApplyReturnModeAsync mutate pointer cho 3 mode OneLevel/
+            // OneStep/Assignee). FE ApprovalsTab render `ev.approvals` — trước
+            // đây Reject KHÔNG add row → Lịch sử duyệt panel mất event Trả lại.
+            var fromStepIdx = evaluation.CurrentWorkflowStepIndex;
+            var fromLevelOrder = evaluation.CurrentApprovalLevelOrder;
+
             if (targetPhase == PurchaseEvaluationPhase.TuChoi)
             {
                 // Từ chối hoàn toàn — phiếu khoá vĩnh viễn (lock edit Mig 16).
@@ -97,6 +104,25 @@ public class PurchaseEvaluationWorkflowService(
                     ? returnSummary
                     : $"{comment} [{returnSummary}]";
             }
+
+            // Plan AC S25 Bug 3a — add Approval row cho Lịch sử duyệt panel
+            // (FE ApprovalsTab). Decision=Reject + Comment carry mode + summary.
+            // From-position dùng pre-call Step/Level để show actor đã trả lại
+            // từ Bước/Cấp nào.
+            var fromPos = fromStepIdx.HasValue && fromLevelOrder.HasValue
+                ? $"[Bước {fromStepIdx.Value + 1} — Cấp {fromLevelOrder.Value}] "
+                : "";
+            db.PurchaseEvaluationApprovals.Add(new PurchaseEvaluationApproval
+            {
+                PurchaseEvaluationId = evaluation.Id,
+                FromPhase = fromPhase,
+                ToPhase = evaluation.Phase,
+                ApproverUserId = actorUserId,
+                Decision = ApprovalDecision.Reject,
+                Comment = $"{fromPos}{comment ?? ""}".Trim(),
+                ApprovedAt = dateTime.UtcNow,
+            });
+
             await LogTransitionAsync(evaluation, fromPhase, evaluation.Phase, actorUserId, decision, comment, ct);
             await db.SaveChangesAsync(ct);
             return;
@@ -468,7 +494,10 @@ public class PurchaseEvaluationWorkflowService(
             }
         }
 
-        // Log approval
+        // Log approval. Plan AC S25 Bug 3b — enrich comment với prefix
+        // "[Duyệt vượt cấp]" khi skipToFinal=true để FE Lịch sử duyệt panel
+        // phân biệt rõ event vượt cấp với approve thường.
+        var skipPrefix = skipToFinal ? "[Duyệt vượt cấp tới Cấp cuối] " : "";
         db.PurchaseEvaluationApprovals.Add(new PurchaseEvaluationApproval
         {
             PurchaseEvaluationId = evaluation.Id,
@@ -476,7 +505,7 @@ public class PurchaseEvaluationWorkflowService(
             ToPhase = evaluation.Phase,
             ApproverUserId = actorUserId,
             Decision = ApprovalDecision.Approve,
-            Comment = $"[Bước {currentIdx + 1} — Cấp {currentLevelOrder}] {comment ?? ""}",
+            Comment = $"{skipPrefix}[Bước {currentIdx + 1} — Cấp {currentLevelOrder}] {comment ?? ""}".Trim(),
             ApprovedAt = dateTime.UtcNow,
         });