I am facing the same issue. I have a dependant dropdown that filters out invalid combinations, however the user is given the option to "SHOW ALL" which renders my dependancy moot.
I need to be able to find a way to remove that option so users cannot select an invalid drop-down. The only workaround I have now is create a check for each invalid combination and create a validitity check module. This is a lot of maintaince when simple removing "SHOW ALL" would solve the issue,
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