Questão jurídica principal
Whether the pension fund's cantonal action was inadmissible because the filing was allegedly unsigned or insufficiently substantiated.
Decisão extraída
The action was properly filed and sufficiently substantiated; the cantonal court did not violate federal law by entering into the case.
Fundamentação extraída
The signatories' authority was sufficiently shown by the organisation rules, and the insured person could reasonably contest the overcompensation calculation using her own payment records. The court could also clarify the relevant data within the inquisitorial framework of Art. 73(2) BVG.