Forums >> Revit Building >> Technical Support >> Family Type Parameter Value Controlled By Formula Not Grayed Out In Project

Bartholomew

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Joined: Mon, Aug 6, 2012
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Can anyone tell me why I would be able to change the value of a family type parameter, in the project, if that parameter’s value is locked and controlled by a formula?

I have a family (Light Fixture) with a locked “type” parameter value controlled by another “built-in” type parameter in the family (e.g. formula=the built in parameter name/2). My expectation is that, when loaded into a project, I should only be able to change the family’s “built-in” parameter value; that the other parameter’s value would be fixed (grayed out) since it’s controlled by a formula. But this is not the case: both parameter values can be changed in the project – peculiarly, with the formula working in reverse (e.g. “built-in” parameter value doubles when I change the other parameter value).

Build: 16.0.462.0

20150506_1715(x64)

Service Pack 1

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Bartholomew

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Joined: Mon, Aug 6, 2012
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Solution courtesy of Andrew K at Reivt Forum:

"To get by this, change the formula for the parameter that you don't want users to be able to control. If(1=1, Formula you want, 0) You can change to whatever true statement you want, if you don't like 1=1."

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