Create Rate Load Definition with Tab Definition via REST API

Summary:

We are currently trying to create a proof of concept to create Rate Load Definitions via REST API.

Content (please ensure you mask any confidential information):

I can successfully create a simple Rate Load Definition using a request like this:

{    "domainName": "DOMAIN",    "rateLoadDefinitionXid": "TEST_1",    "description": "Test description",    "templateRateOfferingGid": "DOMAIN.EXISTING_RATE_OFFERING" }

However, when trying to also create a single Tab Definition like so:

{    "domainName": "DOMAIN",    "rateLoadDefinitionXid": "TEST_1",    "description": "Test description",    "templateRateOfferingGid": "DOMAIN.EXISTING_RATE_OFFERING",    "rateLoadTabDefinitions": [        {            "domainName": "DOMAIN",            "rateLoadTabDefinitionXid": "TEMPLATE_1",            "templateRateGeoGid": "DOMAIN.EXISTING_RATE_RECORD"        }    ]}

I get the following error:

{    "status": 400,    "title": "Content error in message body.",    "detail": "Content not expected after attribute , location (line no=-1, column no=-1, offset=-1)."}