Error When Trying to POST: Method not implemented in data provider class

Hi Experts,

I have created an Odata Service using Netweaver Gateway Service builder. I am using Advanced Rest Client to test the service. I can successfully GET my data, but I run into issues when I try and POST new data.

When trying to POST, I used the GET method to get the x-csrf-token, and added it to my header. I also updated the body XML with the data that I would like to POST. However, after sending the POST request, I am getting a "500 Internal Service Error" with the xml message "Method '<OdataServiceName>'_CREATE_ENTITY" not implemented in data provider class".

Any help on this would be greatly appreciated. Thanks!