If you have paid an invoice and used a future date by mistake (thus having the 'C' print on your open payables report), and the invoice and payment are fully settled, these transactions will be cleared to history when you run Period End and clear the completed transactions. Remember open payables only prints the transactions in the 'current' file, not the historical file.

If the transaction with the 2044 date has not been fully applied, then you can purge it when it has been fully applied. This could mean adjusting the current amount to zero and re-posting that amount with a correct date.