Try to use the common type for SystemData

specification/keyvault/resource-manager/Microsoft.KeyVault/preview/2021-04-01-preview/keyvault.json

@@ -1533,8 +1533,7 @@
           "description": "Tags assigned to the key vault resource."
         },
         "systemData": {
-          "description": "System metadata for the key vault.",
-          "$ref": "#/definitions/SystemData"
+          "$ref": "../../../../../common-types/resource-management/v2/types.json#/definitions/systemData"
         },
         "properties": {
           "$ref": "#/definitions/VaultProperties",
@@ -1935,53 +1934,6 @@
         }
       },
       "description": "Properties of a private link resource."
-    },
-    "SystemData": {
-      "description": "Metadata pertaining to creation and last modification of key vault resource.",
-      "type": "object",
-      "readOnly": true,
-      "properties": {
-        "createdBy": {
-          "type": "string",
-          "description": "The identity that created key vault resource."
-        },
-        "createdByType": {
-          "description": "The type of identity that created key vault resource.",
-          "$ref": "#/definitions/IdentityType"
-        },
-        "createdAt": {
-          "type": "string",
-          "format": "date-time",
-          "description": "The timestamp of key vault resource creation (UTC)."
-        },
-        "lastModifiedBy": {
-          "type": "string",
-          "description": "The identity that last modified key vault resource."
-        },
-        "lastModifiedByType": {
-          "description": "The type of identity that last modified key vault resource.",
-          "$ref": "#/definitions/IdentityType"
-        },
-        "lastModifiedAt": {
-          "type": "string",
-          "format": "date-time",
-          "description": "The timestamp of key vault resource last modification (UTC)."
-        }
-      }
-    },
-    "IdentityType": {
-      "type": "string",
-      "description": "The type of identity.",
-      "enum": [
-        "User",
-        "Application",
-        "ManagedIdentity",
-        "Key"
-      ],
-      "x-ms-enum": {
-        "name": "identityType",
-        "modelAsString": true
-      }
     }
   },
   "parameters": {