Formula Field Cannot be summarized in crystal report

Question

Crystal report page footer formula field not summarized and not display in insert summary.

I have created a Report to generate Sales details, below picture

report

above report I need to display Actual Profit field on each invoice row and finally summarized and get sum of Actual Profit on Page footer.

1. I have created Actual Profit formula field, blow picture its working fine.

created formula

Problem is when i right click report footer section and insert a summary to get Sum of each invoice "Actual Profit" Not viewing formula field "Actual Profit" and also I tried to create a formula to get Total summary of (Sum of) Actual Profit field i'm getting error "This field cannot be summarized." below picture

summarized error

How can I add summary of Total "Actual Profit" on page footer?

Answer 1

An easy option would be to make a hidden Running Total of the Net Profit per Invoice and show this at the page footer.