diff --git a/mysql/migration/2.6.0-2.7.0.sql b/mysql/migration/2.6.0-2.7.0.sql
index 4e855f355a6..4edd80ad1b1 100644
--- a/mysql/migration/2.6.0-2.7.0.sql
+++ b/mysql/migration/2.6.0-2.7.0.sql
@@ -32,6 +32,7 @@ ALTER TABLE llx_expedition ADD COLUMN entity integer DEFAULT 1 NOT NULL AFTER re
 ALTER TABLE llx_facture_fourn ADD COLUMN entity integer DEFAULT 1 NOT NULL AFTER facnumber;
 ALTER TABLE llx_livraison ADD COLUMN entity integer DEFAULT 1 NOT NULL AFTER ref;
 ALTER TABLE llx_fichinter ADD COLUMN entity integer DEFAULT 1 NOT NULL AFTER ref;
+ALTER TABLE llx_contrat ADD COLUMN entity integer DEFAULT 1 NOT NULL AFTER ref;
 
 ALTER TABLE llx_rights_def DROP PRIMARY KEY;
 ALTER TABLE llx_user_param DROP INDEX fk_user;
@@ -75,4 +76,5 @@ ALTER TABLE llx_facture ADD UNIQUE INDEX idx_facture_uk_facnumber (facnumber, en
 ALTER TABLE llx_expedition ADD UNIQUE INDEX idx_expedition_uk_ref (ref, entity);
 ALTER TABLE llx_facture_fourn ADD UNIQUE INDEX uk_facture_fourn_ref (facnumber, fk_soc, entity);
 ALTER TABLE llx_livraison ADD UNIQUE INDEX idx_livraison_uk_ref (ref, entity);
-ALTER TABLE llx_fichinter ADD UNIQUE INDEX uk_fichinter_ref (ref, entity);
\ No newline at end of file
+ALTER TABLE llx_fichinter ADD UNIQUE INDEX uk_fichinter_ref (ref, entity);
+ALTER TABLE llx_contrat ADD UNIQUE INDEX uk_contrat_ref (ref, entity);
\ No newline at end of file
diff --git a/mysql/tables/llx_contrat.key.sql b/mysql/tables/llx_contrat.key.sql
index a355ae22342..1c757fa6c86 100644
--- a/mysql/tables/llx_contrat.key.sql
+++ b/mysql/tables/llx_contrat.key.sql
@@ -1,6 +1,7 @@
 -- ============================================================================
 -- Copyright (C) 2002-2004 Rodolphe Quiedeville <rodolphe@quiedeville.org>
 -- Copyright (C) 2004-2005 Laurent Destailleur  <eldy@users.sourceforge.net>
+-- Copyright (C) 2005-2009 Regis Houssin        <regis@dolibarr.fr>
 --
 -- 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
@@ -25,6 +26,8 @@
 -- V4 DELETE llx_contrat FROM llx_contrat LEFT JOIN llx_societe ON llx_contrat.fk_soc = llx_societe.rowid WHERE llx_societe.rowid IS NULL;
 -- V4 DELETE llx_contrat FROM llx_contrat LEFT JOIN llx_user ON llx_contrat.fk_user_author = llx_user.rowid WHERE llx_user.rowid IS NULL;
 
+ALTER TABLE llx_contrat ADD UNIQUE INDEX uk_contrat_ref (ref, entity);
+
 ALTER TABLE llx_contrat ADD INDEX idx_contrat_fk_soc (fk_soc);
 ALTER TABLE llx_contrat ADD INDEX idx_contrat_fk_user_author (fk_user_author);
 
diff --git a/mysql/tables/llx_contrat.sql b/mysql/tables/llx_contrat.sql
index ea30f2cd20a..0d2bc7770de 100644
--- a/mysql/tables/llx_contrat.sql
+++ b/mysql/tables/llx_contrat.sql
@@ -1,6 +1,7 @@
 -- ============================================================================
 -- Copyright (C) 2002-2004 Rodolphe Quiedeville <rodolphe@quiedeville.org>
 -- Copyright (C) 2004-2005 Laurent Destailleur  <eldy@users.sourceforge.net>
+-- Copyright (C) 2005-2009 Regis Houssin        <regis@dolibarr.fr>
 --
 -- 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
@@ -21,23 +22,25 @@
 
 create table llx_contrat
 (
-  rowid           integer AUTO_INCREMENT PRIMARY KEY,  
-  ref         	  varchar(30),		-- reference de contrat
-  tms             timestamp,
-  datec           datetime, -- date de creation de l'enregistrement
-  date_contrat    datetime,
-  statut          smallint DEFAULT 0,
-  mise_en_service datetime,
-  fin_validite    datetime,
-  date_cloture    datetime,
-  fk_soc          integer NOT NULL,
-  fk_projet       integer,
-  fk_commercial_signature integer NOT NULL,  	-- obsolete
+  rowid                   integer AUTO_INCREMENT PRIMARY KEY,  
+  ref         	          varchar(30),		            -- reference de contrat
+  entity                  integer DEFAULT 1 NOT NULL,	-- multi company id
+  tms                     timestamp,
+  datec                   datetime,                   -- date de creation de l enregistrement
+  date_contrat            datetime,
+  statut                  smallint DEFAULT 0,
+  mise_en_service         datetime,
+  fin_validite            datetime,
+  date_cloture            datetime,
+  fk_soc                  integer NOT NULL,
+  fk_projet               integer,
+  fk_commercial_signature integer NOT NULL, -- obsolete
   fk_commercial_suivi     integer NOT NULL,	-- obsolete
   fk_user_author          integer NOT NULL default 0,
   fk_user_mise_en_service integer,
-  fk_user_cloture integer,
-  note                text,
-  note_public         text
+  fk_user_cloture         integer,
+  note                    text,
+  note_public             text
+  
 )type=innodb;