I have a report that uses Header to group items together, in the group I get a percentage of the total (each group is certain part of 100%). I make the detailed data invisible so this is just some kind of summary report. Now, I would like to sort the report by the percentage. Grouping and sorting icon allows me to sort only by fields from underlying query but in this case I need to be able to sort by the calculation field done in the report. Is it possible?