If you paid State Tax on your 1099-R distribution (there is an amount in Box 14), then you must also have an entry in Box 15 (Payer's State ID number), and Box 16 (amount of state distribution, which is usually the same amount as in Box 1).
If you didn't pay State Tax on your distribution (no amount in Box 14), then you can leave Boxes 14-16 blank in TurboTax.
Here's more info on How to Enter a 1099-R.
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