Supreme Court rules revaluation rules apply to new periods only, not the whole pension, preventing retroactive reduction.

The Supreme Court resolved a legal question regarding the calculation of pension revaluation when new contribution periods are added after the initial award. The applicant argued that adding post-award periods should increase the entire pension, while the Social Security Office applied rules that recalculated the whole amount, potentially lowering it. The Court rejected the Office's interpretation as unjust and contrary to the principle of acquired rights, ruling that revaluation rules apply only to the new periods, not the total pension.