On your 1099-R, if any State Tax was withheld in Box 14, there needs to be an amount in Box 16 (normally the same amount as Box 1 or Box 2a).
If no state tax was withheld, you can leave Boxes 14-16 blank in TurboTax. The Box 1 or 2a amount will transfer to your state return, and, depending on your state, may be non-taxable, partly taxable or fully taxable.
Here's a link to state Dept. of Revenue sites.
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