Sourcing Cockpit and Purchasing Groups

The situation in this : running extended Classic on SRM 3.0 (technical layer) with EBP 4.0 (functional layer). EBP organisation hierarchy/data is replicated from R/3. The professional buyer (the person who works in Sourcing), their Position is not assigned to the EBP local Purchasing Group. When they run the transaction Carry out Sourcing, their Worklist is always blank (because there is no User Id assigned to the P.Grp and therefore no one responsible) so they must use the Find tab to locate carts to process.

If I assign the Professional Buyer to the P.Grp, this will be undone the next time data is replicated from R/3 and the Prof.Buyer will be assigned to the org.unit as per R/3.

I would be grateful of any hints and tips that I can workaround this. One option is to create a dummy User Id and assign to the Purchasing Group although this is a little clumsy as the Prof. Buyer has 2 User IDs to do their job.

Cheers