REST API Batch Actions for PO Change Orders

Summary:

Trying to create PO change orders using the Draft Purchase Orders API resource. The discrete API works fine, but its not working when used as Batch Actions. Is this supported?

Content (please ensure you mask any confidential information):

Request

https://<xx>/fscmRestApi/resources/11.13.18.05/

Method: PATCH

Header: 'Content-Type: application/vnd.oracle.adf.batch+json'

Body:

{    "parts": [        {            "id": "part1",            "path": "/draftPurchaseOrders/22084",            "operation": "invoke",            "payload": {                "ChangeOrderDescription": "change order",                "ChangeOrderInitiatingParty": "BUYER",                "lines": [                    {                        "POLineId": 27083,                        "CancelFlag": true,