diff --git a/apps/wpmw/models.py b/apps/wpmw/models.py
index 70827eb1..af092087 100644
--- a/apps/wpmw/models.py
+++ b/apps/wpmw/models.py
@@ -92,8 +92,9 @@ class Wpr(BaseModel):
             raise ParseError(f"请检查-{ins.number}-所属仓库批次")
         if old_wm and ins.wm != old_wm:
             raise ParseError(f"请检查-{ins.number}-所属车间批次")
-
-        ins.wpr_from = wpr_from
+        
+        if wpr_from:
+            ins.wpr_from = wpr_from
         ins.mb = mb
         if mb:
             ins.material = mb.material