Retrospective amendment of CENVAT Credit Rules validates prior actions and confers retrospective rulemaking power authority. The Bill amends sub-rule (6A) of rule 6 of the CENVAT Credit Rules, 2004 to deem that the 2011 insertion operated retrospectively from the date and in the manner specified in the Eighth Schedule, validates all actions taken or purported to have been taken in that period notwithstanding any judicial or administrative orders, and deems the Central Government to have had retrospective rulemaking power to effect that amendment; the amendment takes effect on enactment upon presidential assent.