diff --git a/apps/wpm/views.py b/apps/wpm/views.py
index 750c0904..83123d2e 100644
--- a/apps/wpm/views.py
+++ b/apps/wpm/views.py
@@ -746,6 +746,9 @@ class MlogbOutViewSet(UpdateModelMixin, CustomGenericViewSet):
 
     @transaction.atomic
     def perform_update(self, serializer):
+        material_out = serializer.validated_data.get('material_out')
+        if material_out and material_out.tracking == Material.MA_TRACKING_SINGLE:
+            raise ParseError("单件产品不支持直接修改")
         ins:Mlogb = serializer.save()
         ins.mlog.cal_mlog_count_from_mlogb()