SUS - Multiple backend systems (MM & SRM)

Hi
I am implementing a SUS client linked to both SRM (seperate client) and MM.
SAP refer to this as the 1:n scenario http://help.sap.com/saphelp_srm50/helpdata/en/cd/0e343e47fd6b2ee10000000a114084/frameset.htm
All interfaces are working correctly except for SUS PO confirmation --> Backend.
For MM-SUS the PO confirmation message route is:
SUS to PI - PurchaseOrderConfirmation_Out
PI to ERP - ORDRSP.ORDERS02 idoc
For SRM-SUS the PO confirmation message route is:
SUS to PI - PurchaseOrderConfirmation_Out
PI to SRM - PurchaseOrderConfirmation_In
The problem we have is getting PI to send the appropriate message back to the appropriate backend system.
Has anyone implemented this scenario?
If so can you explain how PI deals with this?
Do we need 2 interfaces in place?
Thanks
James
Edited by: J-Wilson on Jan 19, 2012 1:25 PM

thats something to do with PI.
they get source XML from SUS. and in PI after deciding target system they have to decide the target. I dont have that much knowledge on PI but i know that they have a place in the integration builder to pass the condition for a field from XML. according to that they need to decide the target interface..
i think SAP must have provided guidelines for PI to configure for SUS.

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SUS - Multiple backend systems (MM & SRM)

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