Kernrechtsfrage
Whether the buyer could assert counterclaims in the context of the reconventional proceedings under Art. 8 LDIP.
Extrahierter Entscheid
Art. 8 LDIP did not displace applicable cantonal procedural rules; the buyer could not be allowed to add re-reconventional claims.
Extrahierte Begründung
Art. 8 LDIP governs substantive conditions of counterclaims in international matters, but cantonal procedural admissibility requirements remain applicable. The challenge concerned cantonal procedural law and was therefore not reviewable in reform proceedings.