If you already reported the recharactorization in the IRA contribution section in 2015 then that is all that is necessary. A 1099-R with a code R does nothing and does not need to be entered - it simply informs the IRS of the recharacterization.
What TurboTax means by amending 2015 does not mean to enter the 1099-R in 2015 but to enter the recharactorization in the IRA Contributions section and enter an explanation when the interview asks for it - which, if your reported in 2015, you have already done.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
