Questione giuridica chiave
Whether the appeal against the interlocutory ruling was admissible under Art. 50 OG.
Decisione estratta
The appeal was admissible because the appellate court had decided a legal question that could dispose of the reduction claim and avoid costly evidence proceedings.
Motivazione estratta
The cantonal court had not yet ruled on the factual prerequisites of the reduction ground; the federal court could decide the legal applicability of Art. 527 No. 4 CC first.