24.0.1. A teacher or officer who ceases to be a member of his plan and becomes a member of this plan may, unless he has elected to become a member under section 13, be credited under this plan with all years or parts of years that could have been credited under section 21 of the Act respecting the Teachers Pension Plan (chapter R-11) or section 66.1 of the Civil Service Superannuation Plan (chapter R-12), as the case may be, provided he satisfies the conditions prescribed therein.