diff --git a/mysql/tables/llx_product.sql b/mysql/tables/llx_product.sql
index d938d9dcef1..de421e25042 100644
--- a/mysql/tables/llx_product.sql
+++ b/mysql/tables/llx_product.sql
@@ -1,6 +1,5 @@
--- ===================================================================
--- $Id$
--- $Source$
+-- ============================================================================
+-- Copyright (C) 2002-2003 Rodolphe Quiedeville <rodolphe@quiedeville.org>
 --
 -- This program is free software; you can redistribute it and/or modify
 -- it under the terms of the GNU General Public License as published by
@@ -16,14 +15,17 @@
 -- along with this program; if not, write to the Free Software
 -- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 --
--- ===================================================================
+-- $Id$
+-- $Source$
+--
+-- ============================================================================
 
 create table llx_product
 (
   rowid           integer AUTO_INCREMENT PRIMARY KEY,
   datec           datetime,
   tms             timestamp,
-  ref             varchar(15),
+  ref             varchar(15) UNIQUE,
   label           varchar(255),
   description     text,
   price           smallint,