Sending a SOAP response immediately upon receipt - synchronous interface

Hi,

We have an outbound synchronous SOAP interface on XI which is called by a sender system. Although the process is asynchronous, the sender system can only handle synchronous web service calls (apparently some limitation of that system).

What I would like XI to do is send a response immediately upon receipt of the message and then continue with the BPM (so not waiting the completion of the BPM before sending back the response).

Does anyone know the procedure for doing this?

Thanks. Best regards,

Cedric