diff --git a/message.xml b/message.xml
index 231116833e..8be01aaacb 100644
--- a/message.xml
+++ b/message.xml
@@ -2,7 +2,7 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <tryton>
-    <data group="1">
+    <data grouped="1">
         <record model="ir.message" id="msg_product_change_cost_price">
             <field name="text">You cannot change the cost price of a product which is associated to stock moves.
 You must use the "Modify Cost Price" wizard.</field>