Sychronous BPM

Question

My scenerio: R/3>PI>ExternalPartner via HTTPS URL. IDoc(Orders05) from R/3 will come  in Sychronous mode(Best Effort) and in PI I'm converting into xCBL format and sending to parnter. I'm  getting the functional ack xml file back immediately in the same URL. So far this design is working perfectly. Now i'm requirement is :  I've to convert  into two different output file for the IDOC which comes from R/3 in sychronous mode.
1. Convert into xCBL format(which is the above one) and send to external parnter.
2. Convert into another format and send back to R/3.
I've done the above scenerio to convert the IDOC file into two different format using BPM. This in asychronous mode using BPM. But with this design, I'm not getting the functional ack file from my external partner since my message interface is asychronous mode.
For my new requirement, I created Abstract Sychronous message interface but I'm not seeing that inside my BPM. When searched in the SDN, i understand that BPM doesn't support Abstract Sychronous message interface.
So how to achieve this scenario.
Thanks,

Answer 1

The point you are misisng here is create  two abstract interfaces (req and response) for third party and use sync send step,so you will get response.
Regards,
Raj