I got a message from a vendor saying his check never arrived. When I looked at the address in my system, I realized it was was incorrect. I voided the check and issued him a new check to the correct address. A few hours later he calls me and tells me the first check arrived and he will mail back the second one. I don't want to have to ask him to wait for the second check instead since he already waited a week for the first one. Is there a way I can undo the void of the first check? Lesson learned - do not void a check unless you have it in your possession.