Hi,
In Report Studio when creating a calculation, dragging in expression items from the Source tab (the package) indicates that the timing should be before the default aggregation occurs. Dragging in expression items from the data items tab (query) indicates that the timing should be after the default aggregation occurs.
Detail filters can be defined as applying either before or after the default aggregation occurs, using the 'Application' property.
If you define a calculation from the source tab and a detail filter with the Application set to be after default aggregation, does this give you what you need?
Regards,
MF.