When creating one time checks, if a check number is voided and then reprinted, a duplicate check number could be created.
We are currently evaluating this issue and will update this article when we have more information.
Steps to Duplicate
1. Accounts Payable > Banks > Create a new One time check > Enter required fields > Print immediately (to a PDF writer, etc.) using Print now 2. Note the check number used 3. Unmark the successful > select to void one time checks > Click ok > Click Ok to additional prompt 4. Go back into Edit unwritten one-time checks > Open the one-time check 5. Note the check number is the same as the one just voided > Click Print Now > Click Ok to it printing successfully 6. Open Register > Note there are now 2 checks with the same check number (one voided, the other Outstanding)