I'm looking at the 850 and the 860, trying to figure out why there's an 860 in the first place. The 860 seems to have just about the same fields that the 850 has. Since there's only 999 document numbers available, why did they define the 860 instead of adding some semantics to the 850? After all, there is a Transaction Set Purpose Code of 04-Change, which is valid for the 850.
I assume that I'm missing something. Can anyone explain?
Thanks.
