I went back to the 1099 input page and entered $15,600 in line 1, Gross Distribution.
In line 2a, on the 1099, $15,600 appeared, but on the input form, I entered $7,600.
In the actual 1099, box 2b, Taxable amount not determined is checked.
After this, the 1040 still does not show $7,600 in line 4b.
