Problem for Bapi Call in Integration Scenario

Hi

I am creating an Integration Scenario at Design time which can be used during configuration time.In the Int. Scenario, I am using a Int Process(BPM). I am making a synchronous call to BAPI from my BPM. How can this be implemented in Integration Scenario.

So how can I send a input message from BPM to BAPI and then take further steps only after getting response from BAPI. Is there any way to define synchronous Action in Int Scenario??? And another point to be noted is that we are not using any communication channel to send the message from BPM or receive the response in BPM. We have only a receiver communication channel which receives the message for the BAPI.

So please help in solving this problem.

regards,

Biranchi