diff --git a/json/discount_promo_code_list.json b/json/discount_promo_code_list.json
index 6102288..db4f0fc 100644
--- a/json/discount_promo_code_list.json
+++ b/json/discount_promo_code_list.json
@@ -27,7 +27,8 @@
         },
         "editexclouded": [
             "resellerid",
-            "sale_id"
+            "sale_id",
+            "created_at"
         ],
         "editable": {
             "new_data_url": "{{entire_url('../api/promo_code_create.dspy')}}",