To void a check from a closed / prior period:  Enter a deposit in the current period for the total amount and post it to principal & interest accounts.  Put in the description the Check #s that you are voiding.  This puts the amount back in the checking account.

Then, when you reconcile the bank account check the checks being voided & the deposit as being cleared.  

Reissue a check as needed.

I hope this was helpful, if so please click yes.