Hi
Normally, I would say you are pooched. But there is a way out if you can justify the time.

Backup your AP data.

You can reverse the cheques printed (with the wrong Cheque #) for every cheque printed, and then go back into manual cheques and regenerate each cheque (without printing) for the selected vendor that the cheque was sent out. This means checking the stub details on the first sent out cheq and entering in the vendor and cheque # for the selected invoices that now show up as needing to be paid (because of reversal). How many cheques that are in your cheque run depends on whether you would do with manual cheques.

Alternatively, you could reverse the cheques and immediately do a precheck register (system cheque run) with the same date settings as your May 14th cheque run. It will sort the vendors in the same sequence but may pick up additional vendors and additional invoices (entered since May 14). Then you match up the Cheq stubs to the vendor invoices and toggle off the payment amounts using the Payments Tab included in this fix cheque run so that the precheck register after toggling off, matches exactly to your May 14th cheque run. Fairly easy to do but might suggest someone other than the person that printed the original cheques incorrectly.

If you balance exactly to the same amount and number of vendors, then backup up your AP data again, and select Print and post using the original chq number (from the May 14 run) as the next cheque number. Print the cheques to a file. Do not use more cheque stock paper. You will get a message that this cheque number has already been used but you can ignore it. This process will regenerate the same cheque numbers for the same vendors (in the same order), and generate the required GL entries assuming you put in the same transaction date. You will see a reversed cheque transaction in the AP transaction history for the incorrect printed number, but a corrected number for the sent out cheque. The next time you run a cheque run you will need to reset the next cheque number to next cheque stock paper form available.

If you have already started to clear the cheques in BankRec or in Payables, do not consider either of these suggestions, as you are truly pooched for this situation.

Best,
Brian