diff --git a/apps/inm/services.py b/apps/inm/services.py
index e66493c5..368205f9 100644
--- a/apps/inm/services.py
+++ b/apps/inm/services.py
@@ -165,7 +165,7 @@ def do_in(item: MIOItem):
         else:
             raise ParseError(f'{str(xmaterial)}-{xbatch}车间物料不足')
         
-        wm_production_dept = wm.mgroup.belong_dept if wm.mgroup else None
+        wm_production_dept = wm.mgroup.belong_dept if wm.mgroup else wm.belong_dept
         if production_dept is None:
             production_dept = wm_production_dept
         elif wm_production_dept and production_dept != wm_production_dept: