Is there a way to do the following:
Set purchasing view "source list required" so that the material must be purchased from ANY of the sources on the source list... AND...
Setup the source list so that there are no overlaps, and MRP sources from consecutive contracts based on the source list validity dates.
For example, 1/1/10 to 5/1/10 -> Contract A (mrp relevant); 5/2/10-10/1/10 -> Contract B (mrp relevant). But on 5/3/10 I want to be able to manually change the requisition away from "B" and release against Contract A. In other words, I want MRP to get the sourcing close to correct, but allow the user the ability to override the MRP sourcing, AND still ensure that the source the user picks is on the source list somewhere.
When I try this now, the system generates "Source list not included in list despite source list requirement." The source list checking seems to be done all the way at the validity period level.