diff --git a/htdocs/install/mysql/migration/12.0.0-13.0.0.sql b/htdocs/install/mysql/migration/12.0.0-13.0.0.sql
index 17b58f278cf..35f2e4e8a54 100644
--- a/htdocs/install/mysql/migration/12.0.0-13.0.0.sql
+++ b/htdocs/install/mysql/migration/12.0.0-13.0.0.sql
@@ -310,4 +310,8 @@ ALTER TABLE llx_actioncomm_reminder ADD INDEX idx_actioncomm_reminder_status (st
 
 ALTER TABLE llx_inventorydet ADD UNIQUE uk_inventorydet(fk_inventory, fk_warehouse, fk_product, batch);
 
+ALTER TABLE llx_product_attribute ADD COLUMN ref_ext varchar(255) AFTER ref;
+ALTER TABLE llx_product_attribute_combination ADD COLUMN variation_ref_ext varchar(255) AFTER variation_weight;
 
+ALTER TABLE llx_product_attribute ADD COLUMN ref_ext varchar(255) AFTER ref;
+ALTER TABLE llx_product_attribute_combination ADD COLUMN variation_ref_ext varchar(255) AFTER variation_weight;