6. For the purposes of this plan, an employee is a member of a plan from the first day on which the employee holds pensionable employment.
However, an employee who, on 31 December 2000, is a member of the Government and Public Employees Retirement Plan as an employee governed by the special provisions enacted under Title IV.0.1 of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10) and who, on that date, remains entitled to be governed by those provisions, shall become a member of this plan on 1 January 2001 to the extent that, on that date, the employee would have continued to be a member of the Government and Public Employees Retirement Plan if those provisions had not been replaced by this Act.