Improve the error message.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17199 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/Form.py

@@ -933,8 +933,9 @@ def get_field_meta_type_and_proxy_flag(field):
         try:
             return field.getRecursiveTemplateField().meta_type, True
         except AttributeError:
-            raise AttributeError, 'The proxy target of %s field does not '\
-                  'exists. Please check the field setting.' % field.getId()
+            raise AttributeError, 'The proxy target of %s.%s field does not '\
+                  'exists. Please check the field setting.' % \
+                  (field.aq_parent.id, field.getId())
     else:
         return field.meta_type, False