112. Any employee of the social affairs sector who holds a position or employment on a casual basis within the meaning of the regulation made pursuant to paragraph 5 of section 4 of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10) but who had not been engaged for the specific purpose of holding such a position or employment is deemed to be an employee contemplated in that plan from 1 January 1987 even if he held such position or employment between 30 June 1973 and 1 January 1987 with an agency or body of the social affairs sector. Any person who contributes to the Teachers Pension Plan or to the Civil Service Superannuation Plan and who, within 180 days of ceasing to hold office but after 1 January 1987, holds a position or employment in the social affairs sector, on a casual basis within the meaning of the regulations made under paragraph 2 of section 3 of the Act respecting the Teachers Pension Plan (chapter R-11) and under paragraph 1 of section 53 of the Act respecting the Civil Service Superannuation Plan (chapter R-12), but who had not been engaged for the specific purpose of holding such a position or employment, shall continue to be a member of his pension plan insofar as such plan allows him to remain a member. Any person who held a position or employment referred to in this section, between 30 June 1973 and 1 January 1987, and contributed to the Government and Public Employees Retirement Plan, the Teachers Pension Plan or the Civil Service Superannuation Plan, is deemed to have been a member of the plan to which he contributed.