diff --git a/message.xml b/message.xml
index 702f54f..c2c90cc 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_package_quantity">
           <field name="text">The quantity "%(qty)s" of product "%(product)s" is not a multiple of it\'s package "%(package)s" quantity "%(package_qty)s".</field>
       </record>