Restrict free text on the standard Subject field on event/task object, and only allow the desired picklist options to be used?

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Restrict free text on the standard Subject field on event/task object, and only allow the desired picklist options to be used?


Write the Validation rule like the below example to restrict Users if they select the standard available picklist values like the one below. 


OR(
Subject<>"Email",
Subject<>"Call"
)

If you want your own picklist values, you may add them to be allowed to select

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