Remuneration, etc. of the President and certain other officers
Section 84(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) The remuneration and salaries payable to the holders of the said offices and their conditions of service, other than allowances, shall not be altered to their disadvantage after their appointment.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 53–54. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections