get the field recursively. Required for >2 levels proxyfield.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15405 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/ProxyField.py

@@ -367,7 +367,7 @@ class ProxyField(ZMIField):
     """
     template_field = self.getTemplateField()
     if template_field.__class__ == ProxyField:
-      return template_field.getTemplateField()
+      return template_field.getRecursiveTemplateField()
     else:
       return template_field