Syntax:
VLOOKUP(field_to_return, field_on_lookup_object, lookup_value)
Create a validation rule and pass parameters, field_to_return, field_on_lookup_object & lookup_value.
Field_to_return : The field that contains the value you want returned
Field_on_lookup_object : The field on the related object that contains the value want to match
Lookup_value : The value want to match.
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