diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json
index 356232aa05bc..544102706b99 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json
@@ -5813,7 +5813,7 @@
     "BillingActivityEventCategoryProperties": {
       "description": "The properties of an activity event category.",
       "properties": {
-        "name": {
+        "categoryName": {
           "description": "The event category name",
           "type": "string",
           "readOnly": true
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingActivityEventCategory.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingActivityEventCategory.json
index 2a5384b18e4d..0e581d25cc67 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingActivityEventCategory.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingActivityEventCategory.json
@@ -8,10 +8,10 @@
       "body": {
         "value": [
           {
-            "id": "/providers/Microsoft.Billing/billingAccounts/7303440/billingActivityEventCategoryListResult",
+            "id": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingActivityEventCategoryListResult/7303440",
             "name": "7303440",
             "properties": {
-              "name": "ManageAccountAdd",
+              "categoryName": "ManageAccountAdd",
               "relatedProperties": [
                 "AccountAuthType",
                 "AccountCostCenter",
@@ -21,10 +21,10 @@
             "type": "Microsoft.Billing/billingAccounts/billingActivityEventCategory"
           },
           {
-            "id": "/providers/Microsoft.Billing/billingAccounts/7303440/billingActivityEventCategoryListResult",
-            "name": "7303440",
+            "id": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingActivityEventCategoryListResult/7303441",
+            "name": "7303441",
             "properties": {
-              "name": "EaPortalPurchaseOrderNumberUpdate",
+              "categoryName": "EaPortalPurchaseOrderNumberUpdate",
               "relatedProperties": [
                 "DocumentId",
                 "InvoiceId",