For a recharacterization of a contribution made for 2015, it's unnecessary to enter the code R 2016 Form 1099-R into 2016 TurboTax. In 2015 TurboTax, by indicating in the follow-up to entering the Roth IRA contribuiton that you recharacterized the contribution to a traditional IRA, the recharacterization would have been reported on your 2015 tax return with explanation. That's all the IRS needs. If you did not already report the recharacterization on your 2015 tax return, you'll need to amend your 2015 tax return as macuser_22 indicated.
Because all of the necessary information regarding a recharacterization is to be entered on the required explanation statements, TurboTax essentially ignores code N and code R Forms 1099-R. If you want to, you can enter the form for recordkeeping, but TurboTax will otherwise ignore the form.
