splitPickTransactions REST API in a Batch Mode not returning required payload

Summary: We are trying to call the splitPickTransactions REST API in a batch mode. REST API is not returning the response payload.

Content (required):

splitPickTransactions REST API is called in batch mode, content-type used is "application/vnd.oracle.adf.batch+json". We are expecting the response payload to be returned by REST but the response payload is returned as blank.

Here is the response we are getting; we expect correct value in the "payload" field below, but it is returing as null.

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{

    "parts": [

        {

            "id": "1",

            "path": "https://xxxxxxxxxx/fscmRestApi/resources/11.13.18.05/splitPickTransactions",

            "operation": "create",

            "payload": null

        }

    ]

}

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Version (include the version you are using, if applicable):