fix: wpr复用number的bug

apps/wpmw/models.py

@@ -39,11 +39,11 @@ class Wpr(BaseModel):
                 return
         elif number:
             try:
-                ins_x = cls.objects.get(number=number)
-                if ins_x.wm is None and ins_x.mb is None: 
-                    if ins_x.version > 1: # 说明被复用了
+                ins = cls.objects.get(number=number)
+                if ins.wm is None and ins.mb is None: 
+                    if ins.version > 1: # 说明被复用了
                         if wpr_from is None:
-                            wpr_from = ins_x
+                            wpr_from = ins
                     else:
                         raise ParseError(f"该物料编号{number}-已存在不可使用")
                 else: