When you void a check, bank deposit or bank transaction, that transaction is immediately removed from the bank reconciliation. This will cause an out of balance in your bank reconciliation if the void date is in a subsequent month from the original transaction date.
For this reason, we suggest you use the same void date as check date. There are times when you will not be able to use the check date. If you have closed the year and you are unable to change any data for the previous year, you will need to use a different void date.This is OK as long as you understand what is causing the difference. Just make a pencil note on your bank reconciliation that a check was voided in a subsequent month for that amount. Once you do the bank reconciliation for the month you voided the check, the G/L will balance.