Validation rules verify that the data a user enters in a record meets the standards you
specify before the user can save the record. A validation rule can contain a formula or
expression that evaluates the data in one or more fields and returns a value of
“True” or “False”. Validation rules also include an error message to
display to the user when the rule returns a value of “True” due to an invalid
value.
Required Editions
Available in: both Salesforce Classic and Lightning Experience
Available in: Essentials, Contact Manager, Group,
Professional, Enterprise, Performance, Unlimited,
Developer, and Database.com Editions
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