js-tygh-backend-promotion_update.js.diff

diff --git a/js/tygh/backend/promotion_update.js b/js/tygh/backend/promotion_update.js
index de999b7507..93e9159e94 100644
--- a/js/tygh/backend/promotion_update.js
+++ b/js/tygh/backend/promotion_update.js
@@ -111,8 +111,9 @@
                 }
 
                 this.$childSelect.attr('multiple', childSelect2Settings.multiple);
-                this.$childInput.addClass('hidden');
                 this.$childSelect.prop('disabled', false);
+                this.$childInput.addClass('hidden');
+                this.$childInput.prop('disabled', true);
 
                 var value = $.makeArray(this.$childSelect.val()).filter(function (val) { return Boolean(val); } );