I created a report with a bex query as data source. My Report ist grouped by the characteristics block, question and level. On the group header of the block I want to display a vertical line chart which overlaps the underlying sections. Therfore I use as Category (X) the question char and in Total (Y) the keyfigure. Now my chart don't display any data if the keyfigure is set to delegated. If I switch it to sum operation the chart show the data correctly, but I get a warning, that delegated is the recommended operation. Can anybody tell me why?