Key legal question
Whether the pension institution may reclaim the wrongly credited vested-benefits amount under unjust enrichment rules applicable before 1 January 2005.
Extracted holding
Yes. For the relevant period, the restitution claim of a pension institution is governed by Articles 62 ff. of the Code of Obligations.
Extracted reasoning
Because the payment, betrothal, and lawsuit all predated the 1 January 2005 reform, the new statutory restitution rule did not apply; the enrichment claim therefore had to be assessed under general unjust enrichment law.