Inter-Process Asynchronous Event

Hi All,
A question came into my mind when thinking about how to model a procure-to-pay process with BPM for NetWeaver.
Imagine there's a process allowing a purchaser to purchase products from a vendor:
[Purchase Order Processing|http://esoadocu.sap.com/socoview(bD1lbiZjPTAwMSZkPW1pbg==)/render.asp?packageid=DBBB6D8AA3B382F191E0000F20F64781&id=F4EF93509BE111DB2B24000F20DAC9EF]
In Galaxy I would model a couple of human-centric steps for the purchaser to collect the purchase data and then a insert a service invocation/automated step of the asynchronous outbound method PurchaseOrderRequest_Out in the purchaser's ERP backend system.
So far so good. But now I don't want this process to end already but wait for the vendor to confirm by calling the asynchronous inbound service PurchaseOrderConfirmation_In, then afterwards having follow-up human steps for the purchaser.
Question:
Is it possible to have one process model to support this scenario?
Thanks and Kind Regards,
Ingo Taraske

Hi David
Thanks for this information ...But It would be great if you could explain in detail about your suggestion to realize this using 2 different processes(I have highlighted that part)
Unfortunately, this is not possible in EhP1. Wait step or asynchronous message receiving is what we call "event correlation". This is realized in EhP2 using "intermediate message event" according to BPMN 1.1.
"To realize this scenario with EhP1, you need to to model two different processes, the second one starting from the asynchronous wait step. Then, you can use PI/XI to trigger the start of the second process as soon as the PurchaseOrderConfirmation_In is called." --- I couldn't quite catch this...
Best regards,
Arun

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http://blog.fpweb.net/troubleshooting-sharepoint-2013-web-analytics/#.U8NyA_kabp4
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