diff --git a/apps/wpm/views.py b/apps/wpm/views.py
index d1dd67cb..5e0b8551 100644
--- a/apps/wpm/views.py
+++ b/apps/wpm/views.py
@@ -950,7 +950,7 @@ class MlogbInViewSet(BulkCreateModelMixin, BulkUpdateModelMixin, BulkDestroyMode
         m_model = material_out.model
         if m_model is None:
             raise ParseError("生成编号出错:产品型号不能为空")
-        elif m_model and m_model.is_lower():
+        elif m_model and m_model.islower():
             raise ParseError("生成编号出错:产品型号不能为小写")
         # 按生产日志查询
         wpr = (