Making a web service and have a problem

Hi all.
I've greated a synchronous communication. SOAP<->XI<->RFC
No problem to create a webservice from this.
When I implement a BPM for that communication the web service makes the request message as respones message and the response message as request message. I don't get why?
In the synchronous setup the inteface for the SOAP are outbound, synchronous and for the BPM solution the the inteface are abstract, synchronous. I've made abstract asynchronous interfaces for the request and the respone to use inside the BPM.
Can somebody please give me a hint of why the web service swiches the request and respones message in the BPM solution? If you need more information I gladly provide what you need about my solution.
BR
Kalle

Yes the request and the respones are mapped with the Abstarct Asynchronous interfaces.
The mappings are called inside the BPM from a transformation step.
There are no mappings with the source synchronous interface that are abstract when using BPM and outbound when not using BPM and same with the target synchronous interface that are abstract. Created the target synchronous interface when implementing BPM in teh solution.
If not using BPm how should I do this then?
//Kalle

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