Revit IF formula with check box

[jonathan_petitclerc]

Hi, 

I am trying to create an IF formula that I can't seem to find any workaroung to make it work.

I tried something like that :

if(PARAMETERNAME, IFYES, IFNO)

But what I want is that if a certain parameter "PARAMETERNAME" is checked, the checkbox with the formula is unchecked and if the other parameter is unchecked the checkbox is available to check (but not automatically checked)...

As an overview, I want that if I check the checkbox it "locks" a series of checkboxes. 

Thanks!

[aleksei.tkachenko]

Hello

You can lock a series of checkboxes by checking one if you use "not()". See the example. However this command does not make other checkboxes available to check.