i. the amount by which(1) the aggregate of all amounts each of which is a contribution, other than an additional voluntary contribution, a contribution prescribed by regulation for the purposes of clause A of subparagraph i of paragraph c of subsection 4 of section 147.2 of the Income Tax Act or a contribution included in the aggregate determined in respect of the individual for the year under subparagraph a of the second paragraph, made by the individual in the year or any preceding taxation year and after 31 December 1962, to a registered pension plan in respect of a particular year before the year 1990, if all or any part of the particular year is included in the individual’s eligible service under the plan, exceeds
(2) the aggregate of all amounts each of which is an amount deducted, in computing the individual’s income for any preceding taxation year, in respect of contributions included in the aggregate determined in respect of the individual for the year under subparagraph 1, and