I cannot reproduce your error. When I leave the field blank I do not receive any errors in the federal review.
Please try Leave
the question blank that asks Number of Days on Business and leave
blank the question regarding Income Earned in the US. If that does not work, leave out the vacation days to the US if you are
sure that you have no more than 35 US days in a 12 month period (Just
make sure you qualify for the PPT). Any trips to the US that did include US business days, must be included in Form 2555.
