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Hello,
I'm creating an application where I need to use aggregated field functionality.
I've defined two TMSTable components with master - detail relation, then I've added field with type "aggregate" to "detail" table field list. Expression property contains SUM() function with proper field name within parenthesis. "Active" property of aggregate field is set to true.
In my project there's DBText object to which I've bound aggregate field name.
Whatever I do this DBText is always empty.

What am I doing wrong?

I am not sure that I have understood you correctly. Could you send me at evgeniyd*crlab*com a small sample that demonstrates this situation? Please do not forget to include a script to create and fill tables at the server.