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 37fcf0d785f..a41b6825fa3 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
@@ -312,8 +312,5 @@ 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_commandedet ADD COLUMN ref_ext varchar(255) AFTER label;
 ALTER TABLE llx_facturedet ADD COLUMN ref_ext varchar(255) AFTER multicurrency_total_ttc;