Key legal question
Whether the Federal Supreme Court could hear the recourse against a non-final cantonal decision on prescription and validity of the expert agreement
Extracted holding
No. The challenged ruling was incidental, and the conditions for an immediate reform appeal were not met because the case could not be finally terminated by deciding only the prescription issue.
Extracted reasoning
Even if prescription were upheld, proceedings would not end because claims against the summoned third party would remain pending. Procedural economy did not justify an exceptional immediate review, as the evidentiary scope would remain essentially the same with two or three parties.