Box 16 on a Form 1099-R is for entering the pension distribution applicable to the state you live in. If there is not an entry there but you had state tax withheld, then you need to enter the distribution amount for the state you live in, most likely the amount in box 1 or 2(a) on your Form 1099-R. TurboTax can't make that entry for you, since to do so would be making an assumption.
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