I have created a mock 1099-R, filled in box 1a and 2a is zero. TT later questioned if it is for 2018 or 2019, I marked it 2019. Box 7 is marked 'P'. TT keeps flagging the over contribution as an error. How do I fix this?
TurboTax is aware of this e-file issue and is working towards a solution. An update is currently planned on or about April 12th, 2019 to resolve this e-filing issue.
You may still see a warning about the excess contribution, but you should be able to e-file. You can check out this TurboTax FAQ for more information: Excess 401(k) Contribution Preventing E-filing.