Open the 
Payment Journal window.
To void one check, select the line with Computer Check in the Bank Payment Type field. Click Payments, Void Check.
To void all checks, simply click Payments, Void All Checks.
If you decide not to use one or more of the printed checks, you can void one or all of the checks in the payment journal.
Open the Payment Journal window.
To void one check, select the line with Computer Check in the Bank Payment Type field. Click Payments, Void Check.
To void all checks, simply click Payments, Void All Checks.
You cannot void checks posted from a journal template with a check mark in the Force Doc. Bal. field.