Pressing F3 to reconcile a bank account looks for the highest reconcile value entered thus far in the bank account and increments on it if possible. The text VOID is greater than any numerical text. Alpha characters W,X,Y, and Z will be greater than void and will replace VOID when pressing F3.
Instead of using VOID as your reconcile text, use the bank statement date with a -void. For example:
Note, I sugest that you reconcile you voided checks at the end so as F3 can increment on the -1.