Kernrechtsfrage
Whether a nullity complaint under § 305(1) ZPO is admissible against all Obergericht decisions or only those issued in ordinary proceedings.
Extrahierter Entscheid
Only Obergericht decisions rendered in ordinary proceedings may be challenged by nullity complaint.
Extrahierte Begründung
The wording of § 305 ZPO is ambiguous, but the purpose of the provision and the structure of civil procedure support a restrictive interpretation. In particular, extending the remedy to summary proceedings would unnecessarily prolong proceedings, whereas extraordinary federal review remains available as a safeguard.