Kernrechtsfrage
Whether the appeal against the incident decision on res judicata was admissible under Art. 93 LTF
Extrahierter Entscheid
The appeal was admissible because upholding the res judicata objection would have led immediately to a final decision and avoided expensive evidence-taking.
Extrahierte Begründung
The challenged ruling was incidental, but the condition of Art. 93(1)(b) LTF was met because acceptance would have ended the merits action and the underlying access dispute typically requires complex expert evidence.