diff --git a/mysql/tables/llx_product.key.sql b/mysql/tables/llx_product.key.sql
new file mode 100644
index 00000000000..ebaebcc2ee0
--- /dev/null
+++ b/mysql/tables/llx_product.key.sql
@@ -0,0 +1,26 @@
+-- ============================================================================
+-- Copyright (C) 2002-2004 Rodolphe Quiedeville <rodolphe@quiedeville.org>
+-- Copyright (C) 2004-2005 Laurent Destailleur  <eldy@users.sourceforge.net>
+--
+-- 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
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program; if not, write to the Free Software
+-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+--
+-- $Id$
+-- $Source$
+--
+-- ============================================================================
+
+
+ALTER TABLE llx_product ADD UNIQUE uk_product_ref (ref);
+
diff --git a/mysql/tables/llx_product.sql b/mysql/tables/llx_product.sql
index 41b92a5523f..6301ca0ae0a 100644
--- a/mysql/tables/llx_product.sql
+++ b/mysql/tables/llx_product.sql
@@ -25,7 +25,7 @@ create table llx_product
   rowid              integer AUTO_INCREMENT PRIMARY KEY,
   datec              datetime,
   tms                timestamp,
-  ref                varchar(15) UNIQUE NOT NULL,
+  ref                varchar(16) NOT NULL,
   label              varchar(128),
   description        varchar(255),
   note               text,