Louisiana Code of Civil Procedure Tit. III, Art. 646. Amendment of petition to join a party

When the failure to join a party is pleaded successfully in or noticed by a trial court, the latter may permit amendment of the petition so as to make him a party, and may reopen the case if it has been submitted and further evidence is necessary. When such failure is pleaded successfully in or noticed by an appellate court, the latter may remand the case for such amendment and further evidence.