1099-R filed twice

[Santo Gold]

A small 401k plan had 1 payout (rollover) in 2006. By accident, our office and the accountant separetely prepared identical 1099-R's, which the owner/Plan administrator promptly filed both copies with the IRS and sent both versions to the former participants.

Can anyone advise on how to fix this? If we file an amended 1099-R showing $0.00, I'm concerned that might wipe out both 1099s. To do nothing would make it seem that there were 2 distributions. Since this was a rollover with no taxable event, is it best to just do nothing?

Thanks