I've had the same problem -- i.e. I do my family's return and because I submitted my son's return and it got rejected because it needed an IPPIN. That's the only thing that changed after the return was rejected and got the 5 e-file return limit. I called TurboTax Help Line and was told it's the IRS that doesn't allow it, but I also think the software does not allow it since it counted it as a submission.
So we get the pleasure of snail mailing this thing to the IRS.
While I understand the need to ensure that submissions are legitimate, I think both the IRS and Intuit do not make this simpler IMHO.
