Lead is already converted but still editable. Lead OWD-Public/Write/Transfer which i think doesn't have anything to do with converted leads. One solution is to create a validation rule to avoid fields from being edited if status is Converted, but its troublesome to maintain such big validation rule for each field. View and Edit Converted Leads in profile is unchecked. How can I make the Converted Leads read only or make sure that fields are not editable once its been converted?