Final duty can't be extended to a period when provisional anti-dumping duty isn't in force

Customs : Where: (a) provisional anti-dumping was levied on 2-5-2002 and same became ineffective on completion of 6 months on 1-11-2002, and (b) final anti-dumping was levied only on 1-5-2003, then, no anti-dumping duty could be levied during gap period, viz., 2-11-2002 to 30-4-2003