Questione giuridica chiave
Whether the transitional 15-year exception in lit. a para. 4 SchlB IVG is measured from the pension start date or the date of the review/order.
Decisione estratta
The relevant reference point is the beginning of the pension entitlement, not the date of the administrative decision.
Motivazione estratta
The purpose of the provision is to protect vested rights, legal certainty, trust, and avoid futile reintegration attempts; only the entitlement start date is a clear and appropriate fixed point.