diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 4b9865e3..b41ec8cc 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -310,6 +310,9 @@ class HandoverSerializer(CustomModelSerializer):
     def validate(self, attrs):
         if attrs.get('mlog', None):
             attrs['send_mgroup'] = attrs['mlog'].mgroup
+            attrs['send_dept'] = attrs['mlog'].mgroup.belong_dept
+        elif attrs.get('wm', None):
+            attrs['send_dept'] = attrs['wm'].belong_dept
         return super().validate(attrs)
 
     class Meta: