Kernrechtsfrage
Whether the claimant is entitled to a life partner pension under the fund rules despite the absence of a written lifetime designation filed with the fund.
Extrahierter Entscheid
No. The statutory requirement of a written designation filed with the fund during the insured's lifetime is a constitutive condition; oral notices, a will, or other documents do not replace it.
Extrahierte Begründung
Article 39a para. 5 of the fund statutes validly imposes a formal condition compatible with BVG. The claimant proved a life partnership, but the decisive written notice was never received by the fund in time. The court rejected the argument of excessive formalism.