I had a problem with one of those. Turns out there was nothing in box 1a....and it was happy when I put 0.00 in box 1a.
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Something than that? ....Rounding issue? Keep box 11 and the Multiple/PA beak-out to even $$?
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*