Section 97 in The Companies (Accounting Standards) Rules, 2006
97. An enterprise establishes the amortisation schedule for past service cost when the benefits are introduced or changed. It would be impracticable to maintain the detail records needed to identify and implement subsequent changes in that amortisation schedule. Moreover, the effect is likely to be material only where there is a curtailment or settlement. Therefore, an enterprise amends the amortisation schedule for past service cost only if there is a curtailment or settlement.
