Access Denied - Sending Message PI 7.4

Hi,

I am facing this problem when trying to send a Message from 'Test Message' tab in PI 7.4 for one of the interface.

When I send the test message with Blank Payload, it is getting posted. Whereas if I send with the payload it is going to error as below.

This is Soap (XI) (Proxy) to idoc scenario.

I have other interfaces of similar scenarios for which I am able to test. I checked SCV in which this namespace lies, I do not see any difference.

Only this interface with Payload is running into this error.

Please provide your inputs.

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Sendhil