diff --git a/specification/billing/resource-manager/Microsoft.Billing/stable/2021-10-01/types.json b/specification/billing/resource-manager/Microsoft.Billing/stable/2021-10-01/types.json
index f728865dc362..7d5ab856313b 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/stable/2021-10-01/types.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/stable/2021-10-01/types.json
@@ -84,6 +84,10 @@
           "readOnly": true,
           "type": "string",
           "description": "Resource type."
+        },
+        "systemData": {
+          "$ref": "../../../../../common-types/resource-management/v2/types.json#/definitions/systemData",
+          "readOnly": true
         }
       },
       "x-ms-azure-resource": true