How can I get all picklist values in a validation rule?
I'm looking for a suitable function but I cannot find any.
What I need to achieve is that some string is among the picklist values.
Please advise.
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There is no such function to get all picklist values. You can enable the "Strictly Enforce Picklist Values" function for a picklist, or use Apex code, but Validation Rules won't get you where you want to go.
