Multimapping synchronous webservice and async idoc

Experts,
I have a scenario where the sender is webservice (soap) and receiver is IDOC (async) + SOAP (sync)
When a webservice sends order to PI, i need to  create an idoc in SAP as well as send back response message to webservice. (webservice is expecting to send data using the response payload)
We have to generate few values from the request and manipulate them (using message mapping) and send response back. (similar to sync webservice interface)
What is the best way to achieve this? can we integrate both async and sync interface in one interface without using BPM?
Map 1 -> SOAP <-> PI <-> IDOC
Map2 -> SOAP <-> PI <-> SOAP
Best Regards,
Pavan

However if i do make use of BPM then the idoc that will be returned from SAP to PI will be different since the same idoc
cannot send data back.
No problem if the sending and receiving IDOCs are different. The only thing that you need to take care is the IDOC_Request and IDOC_Response should have one field which contains the same value....for correlation in the BPM.
Is there a way we can setup some sort of correlation to make sure that the new idoc that is triggered after the sales order
creation is indeed related to the one that is sent from PI initially.
As mentioned above the IDOC that BPM sends and receives (from ECC) should have a field which has same value.
Regards,
Abhishek.

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