XI adapter in BPM
I have a scenario where a BPM is triggered by a Proxy from SAP. Within BPM some Exception Handling takes place and the correcspodng status is sent back to the sender SAP system. I was asked to use an XI adapter for communication b/w BPM and SAP sender via XI Intergration Engine. Can anyone throw some light why an XI adapter should be used here. Cant BPM directly talk to IE without XI adapter.??