(1) Subject to subsection (2), section 112 does not affect the obligation or right (if any) of a person to whom this Part applies to contribute, in accordance with this Act, for units of pension additional to those for which he is required to contribute under that section.
(2) In the case of a person to whom this Part applies who was a contributor for limited benefits under the Defence Forces Retirement Benefits Act 1948 - 1959 , the number of additional units of pension for which that person would otherwise have the obligation or right to contribute shall be reduced by such number of units of pension as the Board determines to be equivalent to the benefits to which that person would have been entitled under that Act in respect of his deferred pay if he had continued to contribute under that Act and had been a contributor for full benefits under that Act.