OFFICIALS - PENSION - TRANSITIONAL SYSTEM - PENSION RIGHTS - ACQUISITION - PAYMENT OF CONTRIBUTIONS AS THE BASIS THEREOF - INTEREST - CONSIDERATION OF INTEREST - ABSENCE - LOSS OF INCOME FROM THE INVESTMENT OF CONTRIBUTIONS - COMPENSATION OF THE FUND - REFUSAL ( STAFF REGULATIONS OF OFFICIALS , ANNEX VIII , ARTICLES 48 AND 49 ; STAFF MEMORANDUM OF THE COMMISSION NO 16-470/58-F , OF 19 JUNE 1958 )