diff --git a/mysql/migration/2.1.0-2.2.0.sql b/mysql/migration/2.1.0-2.2.0.sql
index f6133a777d6..4bfafc4f829 100644
--- a/mysql/migration/2.1.0-2.2.0.sql
+++ b/mysql/migration/2.1.0-2.2.0.sql
@@ -1120,3 +1120,7 @@ insert into llx_c_pays (rowid,code,libelle) values (243, 'JE', 'Jersey'        )
 insert into llx_c_pays (rowid,code,libelle) values (244, 'ME', 'Monténégro'    );
 insert into llx_c_pays (rowid,code,libelle) values (245, 'BL', 'Saint-Barthélemy');
 insert into llx_c_pays (rowid,code,libelle) values (246, 'MF', 'Saint-Martin'  );
+
+
+ALTER TABLE llx_boxes ADD UNIQUE INDEX uk_boxes (box_id, position, fk_user);
+
diff --git a/mysql/tables/llx_boxes.key.sql b/mysql/tables/llx_boxes.key.sql
index 4a3c57a4e3e..1b0530c37e5 100644
--- a/mysql/tables/llx_boxes.key.sql
+++ b/mysql/tables/llx_boxes.key.sql
@@ -1,5 +1,5 @@
 -- ===================================================================
--- Copyright (C) 2006 Laurent Destailleur  <eldy@users.sourceforge.net>
+-- Copyright (C) 2006-2007 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
@@ -16,14 +16,14 @@
 -- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 --
 -- $Id$
--- $Source$
 -- ===================================================================
 
 
--- Supprimme orphelins pour permettre montée de la clé
--- V4 DELETE llx_boxes FROM llx_boxes LEFT JOIN llx_boxes_def ON llx_boxes.box_id = llx_boxes_def.rowid WHERE llx_boxes_def.rowid IS NULL;
+ALTER TABLE llx_boxes ADD UNIQUE INDEX uk_boxes (box_id, position, fk_user);
 
+-- Supprime orphelins pour permettre montée de la clé
+-- V4 DELETE llx_boxes FROM llx_boxes LEFT JOIN llx_boxes_def ON llx_boxes.box_id = llx_boxes_def.rowid WHERE llx_boxes_def.rowid IS NULL;
 ALTER TABLE llx_boxes ADD INDEX idx_boxes_boxid (box_id);
 ALTER TABLE llx_boxes ADD CONSTRAINT fk_boxes_box_id FOREIGN KEY (box_id) REFERENCES llx_boxes_def (rowid);
 
-ALTER TABLE llx_boxes ADD INDEX idx_boxes_fk_user (fk_user);
\ No newline at end of file
+ALTER TABLE llx_boxes ADD INDEX idx_boxes_fk_user (fk_user);