diff --git a/api/__pycache__/settings.cpython-313.pyc b/api/__pycache__/settings.cpython-313.pyc
index 2274696f..96e8ce74 100644
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diff --git a/app/__pycache__/models.cpython-313.pyc b/app/__pycache__/models.cpython-313.pyc
index f4a43330..f52d7a2d 100644
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diff --git a/app/__pycache__/workflow_utils.cpython-313.pyc b/app/__pycache__/workflow_utils.cpython-313.pyc
index 0f4ac96b..c87b238e 100644
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diff --git a/app/migrations/0351_remove_transaction_detail_amount_recived.py b/app/migrations/0351_remove_transaction_detail_amount_recived.py
new file mode 100644
index 00000000..ffe785b8
--- /dev/null
+++ b/app/migrations/0351_remove_transaction_detail_amount_recived.py
@@ -0,0 +1,17 @@
+# Generated by Django 5.1.7 on 2026-01-08 16:56
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('app', '0350_transaction_current'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='transaction_detail',
+            name='amount_recived',
+        ),
+    ]
diff --git a/app/models.py b/app/models.py
index 428828c8..7eebb309 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1390,7 +1390,6 @@ class Transaction_Detail(AutoCodeModel):
     status = models.ForeignKey(Transaction_Status, null=True, related_name='+', on_delete=models.PROTECT, default=1)
     approver = models.ForeignKey(User, null=True, related_name='+', on_delete=models.PROTECT)
     approve_time = models.DateTimeField(null=True)
-    amount_recived = models.DecimalField(max_digits=15, decimal_places=2, null=True)
     create_time = models.DateTimeField(null=True, auto_now_add=True)
     update_time = models.DateTimeField(null=True, auto_now=True)
 
diff --git a/app/workflow_utils.py b/app/workflow_utils.py
index 54424e5e..3b160130 100644
--- a/app/workflow_utils.py
+++ b/app/workflow_utils.py
@@ -86,6 +86,48 @@ def resolve_value(expr, context):
         target_list.append(element_to_append)
         return target_list
 
+    # =============================================
+    # 2.2. Hàm tổng hợp list: $agg(list, operation, field?)
+    # =============================================
+    agg_match = re.match(r"^\$agg\(([^,]+),\s*'([^']+)'(?:,\s*['\"]?([^'\"]+)['\"]?)?\)$", expr.strip())
+    if agg_match:
+        list_expr = agg_match.group(1).strip()
+        operation = agg_match.group(2).strip()
+        field_expr = agg_match.group(3).strip() if agg_match.group(3) else None
+
+        # 1. Resolve the list
+        target_list = resolve_value(list_expr, context)
+        if target_list is None:
+            target_list = []
+        
+        if not isinstance(target_list, list):
+            return 0
+
+        # 2. Perform operation
+        if operation == 'count':
+            return len(target_list)
+        
+        if operation == 'sum':
+            if not field_expr:
+                return 0
+            
+            total = 0
+            for item in target_list:
+                value = 0
+                if isinstance(item, dict):
+                    value = item.get(field_expr)
+                else:
+                    value = getattr(item, field_expr, 0)
+                
+                try:
+                    total += float(value or 0)
+                except (ValueError, TypeError):
+                    pass
+            return total
+
+        print(f"      [ERROR] Unknown $agg operation: {operation}")
+        return 0
+
     # =============================================
     # 3. Helper: Lấy giá trị từ context theo đường dẫn dotted
     # =============================================
diff --git a/static/contract/TTTHNVCN_371_1767901475.docx b/static/contract/TTTHNVCN_371_1767901475.docx
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diff --git a/static/contract/TTTHNVCN_371_1767901475.pdf b/static/contract/TTTHNVCN_371_1767901475.pdf
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diff --git a/static/contract/TTTHNVCN_373_1767901599.docx b/static/contract/TTTHNVCN_373_1767901599.docx
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