AR 8.0B - this doesn't make any difference for this question.
Applying a posted check or a credit balance to a posted invoice in AR CASH. In this case, we let Adagio generate the Check number (77-2). This turns out to be a duplicate against the historical data. How is the artificial check number generated (77-2) and why doesn't the system check for duplicates? Is the number 77-2 something like the posting journal number and the entry number? Yes, we retain a lot of history but so what - the duplicate is from 2006.

Hi Kay,

This auto-generated document number comes from the batch number and the entry number. Indeed it is possible for it to be the same as a document that was posted in a previous year, should it still exist.

It probably is a good idea to over-ride this check number with perhaps something like the already posted check number and a 'X' suffix (to stay unique, yet be obvious as to the purpose of this cash entry).

The check for duplicates is to catch double entry of the same transaction.