OData V2 POST request in Postman returning “415 Unsupported Media Type” error

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Hey

That error is pretty common with SAP OData V2 services — it’s not a Postman issue but how the SAP Gateway expects the payload format.

By default, many OData V2 services in SAP don’t accept JSON for POST, PUT, or PATCH unless the service was explicitly configured to handle application/json. Most only accept Atom/XML format for write operations.

Here’s what you can try:

1. Use Atom/XML for POST

Set these headers:

Content-Type: application/atom+xml
Accept: application/atom+xml
x-csrf-token: <your valid token>

Then structure your body like this (example):

<entry xmlns="http://www.w3.org/2005/Atom"
       xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"
       xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices">
  <content type="application/xml">
    <m:properties>
      <d:CustomerID>10001</d:CustomerID>
      <d:Name>John Doe</d:Name>
    </m:properties>
  </content>
</entry>

2. Check the Service’s Supported Formats

Run a GET on:

<your_service_url>/$metadata

and look for the m:HttpMethod="POST" sections — if it doesn’t list application/json, you’ll need to use XML.

3. Enable JSON (Optional, Developer-Side)

If you have access to the backend, your SAP developer can enable JSON for write operations by setting the proper format handling in the Model Provider Class or by adjusting the IWFND/MAINT_SERVICE configuration.

So in short:
415 Unsupported Media Type = your OData V2 service doesn’t accept JSON for that entity set.
Try using Atom/XML, and it should work fine.

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