Kernrechtsfrage
Whether the appeal against the internal arbitration award was admissible and whether new documents could be considered.
Extrahierter Entscheid
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.
Extrahierte Begründung
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.