This article outlines how best to account for a voided check that was cashed by your bank.
A Bank Reconciliation should be completed every month for each bank account you have to ensure there are no discrepancies, anomolies, etc. such as a check being cashed that was voided in Constellation1 Accounting.
The easiest way to account for this, is to create a manual bill so that you can complete your reconciliation.
Navigate to Accounts Payable module > Processing > Bills.