Error in response message

Hi Experts,

I am doing SAP to Portal system scenario using SOAP. I am sending request to Portal and getting response from their system.

I need to put the response message in file. While capturing response message i am getting error as below.

com.sap.engine.interfaces.messaging.api.exception.MessagingException: SOAP: response message contains an error XIAdapter/PARSING/ADAPTER.SOAP_EXCEPTION - soap fault: No such operation 'createDocumentWithAttachmentsRequest'

I am getting XML string in response message.

Can anyone please suggest how to capture XML string in the respone message.. if i need to do any java mapping what logic exactly i need to build.

Appreciate your valuable inputs.

Thanks,

Srikanth