Excise duty exemption for goods cleared against RoSL scrips subject to registration, validation and undertaking requirements. Goods specified in the Fourth Schedule are exempt from excise duty when cleared against RoSL duty credit scrips, subject to registration of the scrip with the Customs Authority, presentation of scrip and supplier/manufacturer details to identify the jurisdictional Central Excise Officer and duties leviable but for exemption, electronic debiting of duties by Customs with written advice to the Central Excise Officer, an undertaking by the scrip holder to cover any short debit with interest, endorsement and validation by the Central Excise Officer, and entitlement to drawback or CENVAT credit against the validated debited amount.