Not to be disrespectful, but does anyone realize how ridiculous all this sounds to a CPA?  The answer is just allow the void to occur in the period of the void, as it does in real accounting systems! When you void a check in May that was written in Dec, it does nothing to Dec, but in May when it is voided, there is a debit to cash and it goes back into AP to be paid again.  It's simple, just fix QB!!!