W2 Box 15 data keeps disappearing

I received a W2 from a lawsuit settlement that only has data in boxes a, bMy W2 has data in boxes 1, b, c, 14 and 15.  Turbo tax is not allowing a blank box 1, so I put $0 there.  Box 14 is just "CA SDI $x.xx" and box 15 is "CA  xxxxxxxx".  Whenever I fill in box 15 in TurboTax by picking "California" and typing in the state ID, it erases the fields.  How do I enter this information properly?