BAPI Exposed as Web Service

Hi There,

I'm setting up a simple scenario in which I'll expose a BAPI as Web Service through XI.

There's only one thing I don't have clear, do I have to define data/message types for my incoming SOAP request and reply messages?

Or does XI understands standard SOAP requests from Web Service Clients by default? I know that you can export the WSDL file generated from the BAPI, after that you can generate Web Service clients but how this exactly is handled in XI is unknown.

Thanks, any feedback is appreciated!

Rob.