Where do I put exempt on state withholding line 12 on a 1099-R?

[SusanY1]

You don't need to indicate exempt on the 1099-R entry form, simply leave the box blank to indicate there is no withholding. 

When you are in the state interview, you will have the opportunity to indicate that the income is not taxable in your state (and why) if it is not automatically detected by the type of income.