Hi In my report I have the total column,under the total i have two sub fields:no , Row%and i have another column Cumulative total sub fields are no,***% For the Row % under total i write like this: =Round((Fields!Male.Value+Fields!Female.Value+Fields!Unknown.Value+Fields!Invalid.Value)/Sum(Fields!Male.Value+Fields!Female.Value+Fields!Unknown.Value+Fields!Invalid.Value)*100,2) For the *** % under cumulative total the expression is: =RunningValue((Fields!Male.Value+Fields!Female.Value+Fields!Unknown.Value+Fields!Invalid.Value)/Sum(Fields!Male.Value+Fields!Female.Value+Fields!Unknown.Value+Fields!Invalid.Value)*100,sum,"AgeByGender") But i am getting this error: The Value expression for the textbox '*** %' contains an aggregate function (or RunningValue or RowNumber functions) in the argument to another aggregate function (or RunningValue). Aggregate functions cannot be nested inside other aggregate functions. How to get the cm % for the Cumulative total Please help me Thanks in advance