Questão jurídica principal
Whether the federal appeal against the cantonal decision was admissible
Decisão extraída
The appeal was inadmissible because the complaints were insufficiently reasoned and partly raised issues outside the scope of the lifting-of-opposition proceedings.
Fundamentação extraída
The appellant failed to explain concretely how the cited documents established a sufficient debt instrument or a link between the contractual buyers and the actual purchaser. Several arguments were abstract, unexhausted at cantonal level, or impossible to supplement before the Federal Tribunal.