1099-R 2a and 2b

1099-R Box 1Gross Distribution is entered, and it is the same value as is in 2a, taxable amount.

Box 2a (TAXABLE AMOUNT) has a figure/amount entered as the taxable amount. However -

We see box 2b is checked, which contradicts 2a, by saying (TAXABLE AMOUNT NOT DETERMINED).

Just wondering if this is normal, and can both be true/correct at the same time?

2a (taxable amount) and yet 2b is checked, taxable amount not determined. With an entry in box 4, taxes withheld. Box 4, has an entry for Federal Tax Withheld.

Box 7 is "7". With IRA/SEP/SIMPLE being checked.

How does Turbo Tax (Desktop Deluxe) handle this. Just as every other 1099-R, with box 2b not checked?

Thanks