About model and data exchange with 3rd party solutions: Revit, Solibri, dRofus, Bluebeam, structural analysis solutions, and IFC, BCF and DXF/DWG-based exchange, etc.
question is why and for what reason we can specify weight in materials if we can not
use it in expressions. The way you have showed me I have to make special Xy new variables
and I will have to check it by clicking it in properietes instead of checking it visualy by material
with one line of code