@MaryLou BRCS 

Do not void the old check.  The easiest way to re-issue a check from a prior period it is to create a bank deposit with today's date and assign the deposit to the same expense/asset/liability account as the original check.  Then, issue the new check.  When you do your next bank rec, clear both the old check and the bank deposit (they will net to zero).  Clear the newly-issued check when it actually clears.  This will keep your prior period and current period accurate.