Hi
to resolve this problem at first i send the expression column that i need from controller(mvc) to stimulsoft with sql query and in stimulsoft i created a column in my datasource and used it in my sum function...
After your reply i looked to your documentation and i used a calculated column as a second way to use sum function...
my problem was with a table column that was expression type, not a column that specified in datasource columns and sum function can only work with specified column in datasource .

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i don't know is that possible to add this ability to work with sum function and expression column that isn't specified in datasource or not but my problem solved.
thank you