Tom, that is exactly what I am trying to say. You worded it much better. I imagine a senerio where someone goes to make a part change, says "Dont send off Rev B, its being changed. Send off Rev C!" and as the part is being changed, Rev C.1 gets sent off even though it is the same as Rev B.X.
Realistically this probably wouldnt happen but like you said, fundementally it doesnt make sense to have the same part listed as two different revisions