diff --git a/hb_server/apps/wpm/services.py b/hb_server/apps/wpm/services.py
index 74af318..4440122 100644
--- a/hb_server/apps/wpm/services.py
+++ b/hb_server/apps/wpm/services.py
@@ -177,7 +177,7 @@ class WpmService(object):
         for i in instances:
             ins = WproductFlow()
             ins.wproduct = i
-            for f in WproductFlow.__meta.fields:
+            for f in WproductFlow._meta.fields:
                 if f.name not in ['id', 'wproduct', 'is_lastlog']:
                     setattr(ins, f.name, getattr(i, f.name, None))
             ins.change_str = change_str