Questione giuridica chiave
Whether the respondent's disability pension could be reviewed and revoked under lit. a para. 1 SchlB IVG despite the 15-year exception in para. 4.
Decisione estratta
No. The decisive reference point is the start of entitlement to the pension, not the date the review decision is issued.
Motivazione estratta
The 15-year protection clause serves legal certainty and protection of legitimate expectations. Only the entitlement start is a fixed and suitable benchmark; the later administrative review date would be arbitrary.