Hi Rasmus,
I'm not an WebI expert, but I remind in a project some years ago that is possible create personalyzed LOV's and customize the exposition of the query. Is it not possible?
Another thing is that at that stage wasn't possible to directly select on HANA without model it first on Universe, so maybe time passed and now there are some things automatic and you can access directly a calculation view without model it on universe, but anyhow even in cases like this can't you personalyze an LOV acessing the dimmension directly?
Regards, Fernando Da Rós