Originally Posted by Happy

When that happens, it is an extremely time consuming and very frustrating process to get it fixed.
So why give a chance of that possibility? It is much better to detach the cert from the reservation first - margarita girl has a post just some days ago to explain how to do the detachment online yourself by going thru the modify reservation process - change the payment method from cert to something else - then after the cert is safely returned to the account, you can cancel the reservation without worrying if the IT would mess it up.