Questione giuridica chiave
Whether the appeal against the internal arbitration award was admissible and whether new documents could be considered.
Decisione estratta
The appeal was only admissible within the narrow statutory grounds; the new documents were inadmissible because no basis under Art. 99(1) BGG was shown.
Motivazione estratta
The Federal Tribunal applied the CPC/BGG rules for internal arbitration awards and limited review to the grounds of Art. 393 CPC, excluding ordinary federal-law review and factual reassessment.