I'm guessing this is a permissions error. But everything I've tried enabling hasn't fixed the problem. Does anyone know why this is greyed out or how to fix it?
This is in ArcCatalog.
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Are you in sde geodatabse? Maybe a lock? try remove all users and connect with the owner of this table. Or view permissions in folder where the geodatabase is. – Kirtep Mar 24 '17 at 19:41
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What user are you connecting as? Do you have DBO privilege? Only an owner can edit feature class properties. – Vince Mar 24 '17 at 21:11
For me, this was caused by a schema lock (as suggested by Kirtep). I had edited the RuleID field separately in Python with an update cursor. Once I closed the Python window, I could edit the Representations again. So I suspect the feature class was used somewhere else (e.g., another application, another user), and had an active lock on it.
