Qualification for membership (federal bodies)
Section 156(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) any person employed in the public service of the Federation shall not be disqualified for appointment as Chairman or member of any of such bodies: Provided that where such person has been duly appointed he shall, on his appointment, be deemed to have resign his former office as from the date of the 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 76–77. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections