Hi,
Thank you for your question! I hope you are doing well during these trying times!
From my experience, the only reason I can think of to explain this issue is those certain properties are unusable for making the expression. For example, I cannot think of a way to make use of
Shell/Roof Opening W x H Size
to make the expression. Or maybe you have another opinion about this matter. Could you explain why you need the missing properties for the expression?
Looking forward to hearing from you!
Best regards,
Minh
Minh Nguyen
Technical Support Engineer
GRAPHISOFT