What determines when "Elevation from Level" is disabled (greyed out) for a family?

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These two families, both same category (furniture), both work plane based, neither created as face based (as far as I can tell), neither created as generic then switched to furniture (as far as I can tell), when place in project both placed on work plane (the same one).

So why one can be moved from the work plane, and the other one can't?

File with both attached.

[barthbradley]

Load your Family into another Furniture Family/Template and load that new Family on into your Project.  Can you access the controls for Elevation From Level then?  

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@barthbradley wrote:

Load your Family into another Furniture Family/Template and load that new Family on into your Project.  Can you access the controls for Elevation From Level then?  

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Yes, that works, any idea what's causing it? Maybe it can be solved in the original family, avoiding one nesting.

[barthbradley]

I suspect it has something to do with the Template it was built in originally. Maybe it was built long ago when dinosaurs still roamed the earth -- and before "Elevation from Level" existed. 😉   

[barthbradley]

Interesting. Look what PyRevit reported about that family in the RVT you posted above. 

 

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@barthbradley wrote:

Interesting. Look what PyRevit reported about that family in the RVT you posted above. 

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Weird, because this is what I get when I run it in that same file.

In any case, not sure what that error is telling us 😕