diff --git a/database/3.0.2_to_3.1.0.sql b/database/3.0.2_to_3.1.0.sql
index 538d2c14f..4c390e0b5 100644
--- a/database/3.0.2_to_3.1.0.sql
+++ b/database/3.0.2_to_3.1.0.sql
@@ -325,4 +325,15 @@ INSERT INTO `ospos_sales_items` (sale_id, item_id, description, serialnumber, li
 INSERT INTO `ospos_sales_payments` (sale_id, payment_type, payment_amount) SELECT sale_id, payment_type, payment_amount FROM `ospos_sales_suspended_payments`;
 INSERT INTO `ospos_sales_items_taxes` (sale_id, item_id, line, name, percent) SELECT sale_id, item_id, line, name, percent FROM `ospos_sales_suspended_items_taxes`;
 
+ALTER TABLE ospos_sales_suspended_items_taxes DROP FOREIGN KEY ospos_sales_suspended_items_taxes_ibfk_1;
+ALTER TABLE ospos_sales_suspended_items_taxes DROP FOREIGN KEY ospos_sales_suspended_items_taxes_ibfk_2;
+
+ALTER TABLE ospos_sales_suspended_items DROP FOREIGN KEY ospos_sales_suspended_items_ibfk_1;
+ALTER TABLE ospos_sales_suspended_items DROP FOREIGN KEY ospos_sales_suspended_items_ibfk_2;
+ALTER TABLE ospos_sales_suspended_items DROP FOREIGN KEY ospos_sales_suspended_items_ibfk_3;
+
+ALTER TABLE ospos_sales_suspended DROP FOREIGN KEY ospos_sales_suspended_ibfk_1;
+ALTER TABLE ospos_sales_suspended DROP FOREIGN KEY ospos_sales_suspended_ibfk_2;
+ALTER TABLE ospos_sales_suspended DROP FOREIGN KEY ospos_sales_suspended_ibfk_3;
+
 DROP TABLE ospos_sales_suspended_payments, ospos_sales_suspended_item_taxes, ospos_sales_suspended_items, ospos_sales_suspended;