diff --git a/htdocs/install/mysql/migration/3.0.0-3.1.0.sql b/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
index 452026d5615..75e1c8fa16e 100755
--- a/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
+++ b/htdocs/install/mysql/migration/3.0.0-3.1.0.sql
@@ -30,6 +30,7 @@ DELETE from llx_const where NAME = 'MAIN_MENUFRONT_BARRETOP';
 DELETE from llx_const where NAME = 'MAIN_MENU_BARRELEFT';
 DELETE from llx_const where NAME = 'MAIN_MENUFRONT_BARRELEFT';
 
-ALTER TABLE llx_facture_fourn ADD column   ref_ext             varchar(30) after entity;
+ALTER TABLE llx_facture_fourn ADD column ref_ext varchar(30) after entity;
+ALTER TABLE llx_commande_fournisseur ADD column ref_ext varchar(30) after entity;
 
 
diff --git a/htdocs/install/mysql/tables/llx_commande_fournisseur.sql b/htdocs/install/mysql/tables/llx_commande_fournisseur.sql
index 0e4cc18c81d..ba3275229a7 100644
--- a/htdocs/install/mysql/tables/llx_commande_fournisseur.sql
+++ b/htdocs/install/mysql/tables/llx_commande_fournisseur.sql
@@ -23,12 +23,16 @@
 create table llx_commande_fournisseur
 (
   rowid               integer AUTO_INCREMENT PRIMARY KEY,
-  tms                 timestamp,
-  fk_soc              integer NOT NULL,
+
   ref                 varchar(30) NOT NULL,          -- order number
   entity              integer DEFAULT 1 NOT NULL,	 -- multi company id
+
+  ref_ext             varchar(30),                  -- reference into an external system (not used by dolibarr)
   ref_supplier        varchar(30),
 
+  tms                 timestamp,
+  fk_soc              integer NOT NULL,
+
   fk_projet           integer DEFAULT 0,             -- projet auquel est rattache la commande
   date_creation       datetime,                      -- date de creation 
   date_valid          datetime,                      -- date de validation