Hi Wendy,
All SCs are sourcing relevant.
Not sure if this is what you're asking for
I went to OSS as this problem as it's a show stopper for this client.
We carried out sum additional testing and it turns out it's only MRP items that seem to fail. The failure seems to be related to the system thinking it needs to create a backend reservation.
This was not the case in the 5.0 system we upgraded from.
The system levels are SRM_SERVER 71303 and SAP_APPL 61703.