Creating reports and dashboards | Stimulsoft community forum

I am trying to create a calculated field that summarizes a field. I created a calculated column and for the value I wrote the following:
Sum(invoice.amount), when I include this calculated field in my report, the report does not run. Are we able to create a calculated field with a total of sum? If yes, what am I doing wrong?

Thanks in advance

Please use following expression:
Thank you.