LBT 1.4 MultipleAperture

I’m using LBT 1.4. I assigned some of the windows with a VLT of 0.67 and some with a VLT of 0 to analyze the effect of a particular window and assigned those to the input - aperture in the component-Model. But I’m getting 0 as the UDI results. Should I assign the windows with zero VLT to faces? And is it not possible to assign window panes with different VLTs to the aperture?