diff --git a/htdocs/install/mysql/tables/llx_product_attribute.sql b/htdocs/install/mysql/tables/llx_product_attribute.sql
index f7ebee3cc23..7e00b14d17a 100644
--- a/htdocs/install/mysql/tables/llx_product_attribute.sql
+++ b/htdocs/install/mysql/tables/llx_product_attribute.sql
@@ -20,6 +20,7 @@ CREATE TABLE llx_product_attribute
 (
   rowid INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
   ref VARCHAR(255) NOT NULL,
+  ref_ext varchar(255) DEFAULT NULL,
   label VARCHAR(255) NOT NULL,
   rang INT DEFAULT 0 NOT NULL,
   entity INT DEFAULT 1 NOT NULL