Aloha!  Yes, you can easily void both if the previous year has not been archived; HOWEVER, realize that the voiding will go to the period that they were originally posted to.  If your corporate tax returns have been completed you wouldn't want to void the items (rather, do reversing entries) or your ending balances you gave accountant to prepare the returns will be off.

Thank you.  How do I reverse the uncashed check and apply it to the CM I entered to reverse the AP invoice?

What I usually do, is enter a "negative" check amount same as the check you need to reverse, using the 1-1 Checks/Bank Charges screen, in the current accounting period.

Then, in the bank reconciliation module, you can use this negative amount to cancel out the uncashed check.

Doing this will enable you to remove the uncashed check from your system without affecting closed accounting periods.

What I usually do, is enter a "negative" check amount same as the check you need to reverse, using the 1-1 Checks/Bank Charges screen, in the current accounting period.

Then, in the bank reconciliation module, you can use this negative amount to cancel out the uncashed check.

Doing this will enable you to remove the uncashed check from your system without affecting closed accounting periods.