Question juridique clé
Whether the cantonal court had to join the already proceeded-against co-liable former board member A. to the damages proceedings
Solution extraite
Yes. A co-liable person already targeted by the compensation office had to be joined so that he could be heard and the judgment's res judicata effect could extend to him.
Motifs extraits
The purpose of joinder is to include third parties whose legal position may be affected. According to settled case law, other solidary debtors targeted by the compensation office must be joined, even if their liability is already final. Because A.'s submissions could still influence the allocation of payments and the position of the other organ members, the omission could not be cured without remand.