SRM PO to PI and different vendors - need help

Hi,

We have a scenario in which once SRM creates a PO, the PO XML reaches PI, using RSPPFPROCESS program to process PO to PI & output configuration for xml

PO is now sent to Vendors based on the Vendor Name(provided in po xml).

If the vendor name is VendorA, PO should be sent to VendorA where VendorA is a third party system.

If the vendor name is VendorB, PO should be sent to VendorB where VendorB is a SAP appln.

and VendorC is File server

So how to achieve this?

Can we do this if SRM sends PO xml to xi?

What are the steps to be done by an XI Developer to achieve this.

Points will be awarded for any help.

Thanks