Use Base_redirect to keep parameters given by the previous form.

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Folder_delete.xml

@@ -150,8 +150,7 @@ elif uids:\n
 else:\n
   message = Base_translateString("Please select one or more items first.")\n
 \n
-return REQUEST.RESPONSE.redirect("%s/%s?portal_status_message=%s"\n
-  % (context.absolute_url_path(), form_id, message))\n
+return context.Base_redirect(form_id, keep_items={"portal_status_message":message})\n
 
 
 ]]></string> </value>