Error while calling a Process from Integration

Summary

Error while calling a Message Based Process from Integration

Content

We are calling message event based process from an integration using a POST method, however it is giving following error. It could be due to a role or payload as per message, however payload seems correct as per my knowledge.

Has anyone faced similar issue?

 

Error message is - PostUser  {http://schemas.oracle.com/bpel/extension}runtimeFault: <genericRestFault>

<errorCode>400</errorCode>

<errorPath>

<![CDATA[POST http://host:port/bpm/api/4.0/processes returned a response status of 400 Bad Request]]>

</errorPath>

<instance>

<![CDATA[{"type":"https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1","title":"Error