[-] BO : Bug Fixed #PSCFV-3128 - Incorrect voucher value via product return

controllers/admin/AdminOrdersController.php

@@ -503,6 +503,7 @@ class AdminOrdersControllerCore extends AdminController
 							$cart_rule->active = 1;
 
 							$cart_rule->reduction_amount = $amount;
+							$cart_rule->reduction_tax = true;
 							$cart_rule->minimum_amount_currency = $order->id_currency;
 							$cart_rule->reduction_currency = $order->id_currency;