diff --git a/mysql/migration/1.1.0-2.0.0.sql b/mysql/migration/1.1.0-2.0.0.sql
index 2530b91bb89..8003ec168fc 100644
--- a/mysql/migration/1.1.0-2.0.0.sql
+++ b/mysql/migration/1.1.0-2.0.0.sql
@@ -394,6 +394,8 @@ alter table llx_entrepot add fk_pays integer DEFAULT 0;
 alter table llx_product add stock_propale integer default 0;
 alter table llx_product add stock_commande integer default 0;
 alter table llx_product add seuil_stock_alerte integer default 0;
+update llx_product set ref=substr(label,0,15) where ref is null;
+alter table llx_product modify ref varchar(15) UNIQUE NOT NULL;
 
 alter table llx_groupart add description text after groupart ;
 
diff --git a/mysql/tables/llx_product.sql b/mysql/tables/llx_product.sql
index 87deadc9ba9..4efd3a0f279 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,
+  ref                varchar(15) UNIQUE NOT NULL,
   label              varchar(255),
   description        text,
   price              double,