Multi-Field Formula to replace 0s with Hyphen

[CDIns]

In my workflow, the last thing I do before I export is create a difference column. The problem I am running into is when I export, records with no differences populate the difference column with a "0". I want to replace these with a hyphen instead as its easier on the eyes. 

I currently have the difference field selected in my configuration and the expression I am using is:

if [_CurrentField_] =0 then "-" else [_CurrentField_] endif. 

This expression works but now my output shows blanks instead of the hyphen. Any ideas? am I approaching this the wrong way? 

Thanks, community. 

[griffinwelsh]

Your fields must be strings to contain "-" as their value, but your formula indicates that your fields are numerical value data types. Set all relevant fields to string data type and update your formula to if [_CurrentField_] = "0" then "-" else [_CurrentField_] endif.