Hide last row data in matrix

Hi - i have a matrix with 3 drilldown rows Customer, agreement and project. 

my budgethours do not go down to project niveau, which i only wish to show them on customer and agreement level. but in my matrix it just give me duplicate vaules (as expected since it cannot find a relationship)

is there a way for me to just make sure it does not show any data for the last rowlevel on this specific column? thanks 🙂