If there is an entry in Boxes 14 or 15 on your 1099-R, TurboTax will expect an amount in Box 16.
If Box 14 shows State Tax withheld, you can enter the amount from Box 2a.
If no state tax was withheld, you can delete the State ID number, so that Boxes 14, 15, and 16 are blank.
See this article for more information on Form 1099-R.
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