Part 1 is an older version that is still usable, but once it’s gone we don’t want any more of it to be purchased. Part 2 is the new version that should be ordered once Part 1 is consumed.
This would usually be a perfect case for Run Out and an Alternate as Substitute. However, there are quantity 400 of Part 1 in supplier’s stock and we only use 20 per month. We don’t want to buy all 400 at once. Is there a way to tell MRP that up to 400 pieces can be ordered, and to generate suggestions for the Substitute after that?