Question juridique clé
Whether the cantonal court could enter into the pension fund's appeal against the AI pension decisions.
Solution extraite
No. Because the pension fund had not been joined in the AI proceedings, it was not bound by the disability assessment and had no separate right to appeal once it later learned of the decisions.
Motifs extraits
Under Art. 49(4) LPGA, the pension fund should have been included only if its benefit obligation was presumed. Since it was omitted, the fund was not bound by the AI's assessment; later notification did not create an appeal path.