Resetting AP Check number

I had a user incorrectly enter a check number in a quick payment screen.  The AP manager wants me to set the next check number back to the series that they were using prior to this error.  I went to Setup>Payments>Bank Accounts, queried the correct account, clicked on update and set the last issued document number to what it was prior to the error and clicked apply.  The user ran a check run and they came out with the incorrect numbers.  Am I missing a step here somewhere?

EBS 12.1.3