If you just sold somethimg to someone else , yea you were supposed to wait because ebay can't go on without you getting paid. That what caused trouble and mistake.
That is why we always tell on Ebay we only accept Paypal it is the fastest and easier way rather than check in mail that might takes 1 week to clear up . In other words, be sure to hurry and submit on time before selling yo prevent the future complaint and trouble.