1. Subject to paragraphs 3 and 4, Member States shall adopt the measures necessary to ensure that the vested pension rights of outgoing workers can remain in the supplementary pension scheme in which they vested. The initial value of those rights for the purposes of paragraph 2 shall be calculated at the moment in time when an outgoing worker's current employment relationship terminates.
2. Member States shall, having regard to the nature of the pension scheme rules and practice, adopt the measures necessary to ensure that outgoing workers' and their survivors' dormant pension rights or their values are treated in line with the value of the rights of active scheme members or the development of pension benefits currently in payment, or are treated in other ways which are considered as fair, such as:
(a) where the pension rights in the supplementary pension scheme are acquired as an entitlement to a nominal sum, by safeguarding the nominal value of the dormant pension rights;
(b) where t
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