I've been at this for 2 hours and am ready to give up.
I want to make the Re-Open button disappear or be disabled when the record (Service Activity is OPEN)

Then when it's CLOSED, I want the button TO appear.
I believe this is done with FormStateRule, looking for condition = ReadOnly
I have reviewed all the relevant articles on the Develop1 site, watched 3 of the videos he's made, read every blog i could find and tried every conceivable combination of Display and Enable Rules, True/False/Null and cannot make this work.
I *was* able to make the button disappear entirely, whether the record was open/closed but that's not what I want.
Any input would be appreciated.
Thank you.

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