diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 44e585d3..19079659 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -555,7 +555,7 @@ class MlogbInSerializer(CustomModelSerializer):
 
     def create(self, validated_data):
         mlog: Mlog = validated_data['mlog']
-        if Mlogb.objects.filter(mlog=mlog, mtask=validated_data['mtask'], wm_in=validated_data['wm_in']).exists():
+        if Mlogb.objects.filter(mlog=mlog, mtask=validated_data['mtask'], wm_in=validated_data['wm_in'], parent=None).exists():
             raise ValidationError('该记录已存在')
         if mlog.submit_time is not None:
             raise ParseError('生产日志已提交不可编辑')
@@ -563,7 +563,7 @@ class MlogbInSerializer(CustomModelSerializer):
     
     def update(self, instance, validated_data):
         mlog: Mlog =  instance.mlog
-        if Mlogb.objects.filter(mlog=mlog, mtask=validated_data['mtask'], wm_in=validated_data['wm_in']).exclude(id=instance.id).exists():
+        if Mlogb.objects.filter(mlog=mlog, mtask=validated_data['mtask'], wm_in=validated_data['wm_in'], parent=None).exclude(id=instance.id).exists():
             raise ValidationError('该记录已存在')
         if mlog.submit_time is not None:
             raise ParseError('生产日志已提交不可编辑')