Total formula field in chart view

Total formula field in chart view

Hi,
I want to make a sum of three decimal type fields:A, B and C.
So, I insert formula field: A+B+C. When I switch to view I see formula field, but blank? My goal is to visualize the total value in the chart view.
I remark that I don't want to make a sum of all values in field A or B or C, which I've got correctly by enabling "sum" in column properties view configuration menu.


Thanks in advance.
jucabika


cubakija