Tenure of seat of members (National Assembly)
Section 68(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) A member of the Senate or of the House of Representatives shall be deemed to be absent without just cause from a meeting of the House of which he is a member, unless the person presiding certifies in writing that he is satisfied that the absence of the member from the meeting was for a just cause.
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 49–50. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections