Having wiped it out by entering something else, try to recover that 5-digit code from last year.
Otherwise you're out of luck.
If you get it back (or you wrote it down separately), make sure the AGI field is EMPTY, not zero or some other amount. It will work unless you are being REJECTED for some other unrelated reason.
PS
You can't put a 6 digit PIN in a 5 digit box.
