Key legal question
Whether the refusal to admit the third-party claim against Z.________ AG was lawful
Extracted holding
The refusal was unlawful; the third-party claim had to be admitted.
Extracted reasoning
The court held that at the admissibility stage only the required factual connection between main claim and third-party claim must be examined. A regression claim based on corporate liability under Art. 759 OR is by nature dependent on the outcome of the main action, so the statutory connection exists. The lower court improperly conducted a merits review and pre-empted the later proceedings.