Form 1116 (COPY 1) -- Foreign Tax Credit Comp Wks: Adj Basis of Tot Inv Ast - error if I put in zero

At the Foreign Tax Credit Comp Wks, I can't put zero in for Adj Basis of Tot Inv Ast and Line 4b2c Total, it creates an error and thus doesn't allow me to e-file. I don't have investment in those areas, so it has to be zero (as shown in the screenshots).  

How can I get around it? 

Thank you for your help!

 

 

1c adj basis of tot inv ast.png4b2c.png