diff --git a/message.xml b/message.xml
index 7f65996c53..9fee5a48e3 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_dunning_line_unique">
             <field name="text">Line can be used only once on dunning.</field>
         </record>