How to "un-reconcile" a check?

I accidentally marked a group of checks as reconciled that should not have been. Now I need to void one of those checks and receive the error “statement status must be open in check ledger entry no. = xxxx”. How can I correct this and void the check?

If you have posted the statement from the bank reconciliation function then you cannot un-reconcile the item - You will have to post a reversing journal. If you haven’t posted the statement then you can un-reconcile the item in the same way you reconciled it - select “Apply entries” from the bank reconciliation screen, find your entry and remove the tick.