Trigger an RFC call to ECC from PI using BPM

HEllo Experts,
This is my first time in ccBPM and require your expertise in gaining some insights onto calling an RFC FM using ccBPM.
I am typically implementing the scenario as it is mentioned in this blog: /people/mitesh.parekh/blog/2008/12/01/receiving-aleaud-as-acknowledgment-in-ccbpm in order to generate acknowledgements from ECC.
I have created the IR and ID and I am successfully able to exceute the BPM till step2. Step 3 is the ABAP mapping part for which i have specified teh required properties and Operation mapping too.
My concern is that how do i proceed from Step 4 i,e how do i trigger this RFC call to ECC and receive it in BPM again?
Thanks in advance,
Elizabeth.

I am developing a scenario which looks like this MDM ->PI ( BPM) -> ECC.
Now the Integration process that I am developing is with reference to blog http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/12249. [original link is broken] [original link is broken] [original link is broken]
I am posting MATMAS from MDM which is received in first step(receive step) of this BPM.
2nd step (Send step - BPM) will send this MATMAS05 Idoc to ECC and Pi will have a message id generated for this message.
3rd step of BPM (ABAP mapping) - which will read the actual PI Idoc number from system tables based on the message id from step 2.
4th step: Idoc number retrieved is to be sent in the requset message of RFC ZALEAUD4XI.
5th step: Response of ZALEAUD4XI RFC is to be received in PI and sent for further processing.
Do i need a mapping between the requset output of ABAP mapping and the input RFC requset message of step4?
Thanks,
Elizabeth

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Trigger an RFC call to ECC from PI using BPM

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