This is not related to running an NFR version of the software.

Does the check that you are trying to reverse still exist in the Vendor?s record?

If the check is in current or historical transactions, it can be reversed. The only exception is if it was a prepayment and it has been applied.

The vendor transactions (Current and History) are stored in a different data file than the Check Reconciliation records. Setting the check status in check rec will not affect the vendor transaction listing, and purging transactions will not affect check rec.

All this is possible technically, based on choices the AP people made. Certainly not a dumb question at all!