If Box 2b is checked, then all we have to do is to enter the correct number in box 2a - see the following article. Go through the 1099-R interview and eventually, you will be asked if the amount in box 2a was used as the taxable amount in previous years - check Yes, and you will be done with this section.
If Box 2b is not checked then you will have to make an adjustment elsewhere in the return. Read the following article.
Please see this TurboTax Help article that describes how you need to handle this situation.
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