I've created a workflow rule that will update a field when a record is created or edit. However, the workflow rule is not updating the field when the record is created, just when the record is updated. I need this field update when the record is created as well.
My formula:
AND(OR(ISCHANGED( BillingPostalCode ),
ISCHANGED( FirstName ),
ISCHANGED( LastName )))
What's wrong in the formula?