I have a model where the the wall openings (windows and doors) are modelled as curtain wall. I want to find out which curtain walls are cutting which basic wall so i can filter. Why? I want to subtrack the Type parameter “function” from basic wall and apply that to the same curtain wall. see it as following: Curtain wall is a element and i want to find out which basic wall is the host. Can somebody look into my script a let me know what i am doing wrong?