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?
I came across a case where the WxH of the skyligth is needed and this is for scheduling.
I wanted to create a property sequence for the WxH of all types of the openings so I can have only one column in my schedule. Now that the skylight dimension is missing this is not possible and two columns are needed which makes the schedule a bit strange.
I also realized after I posted my first comment that the Door/Window WxH size parameter cannot be used in the expression properties. It does not give any result even if it is set as string.
Is this a limitation in expressions. Any solution?
Typically this is a workaround for one column appearance in a schedule with openings for two reasons.
1. I cannot find a way to produce results with the Property:Window\/Door/Nominal W x H Size. It is recognized as string but it does not gives results.
2. There is no Nominal WxH size for skylights.
In any case Archicad has always a second option to everything and this is the great thing about it!!!!!
Big thanks to you for finding out the solution! I'm trying to figure out a way to achieve the same result, however, I have not yet succeeded! This is a great solution!
I can totally understand your request to have the same Nominal W x H for both skylight and windows. We had a similar request in our WishList database already. Hopefully, our Product Manager will adopt this feature soon!
Thank you once again for your finding! Have a great evening, and take care!