Interest rate fixation under section 11BB establishes a uniform annual rate and supersedes an earlier notification with a saving clause. Prescribes a statutory annual interest rate under section 11BB of the Central Excise Act, 1944 and, exercising powers under that section, fixes a uniform rate of interest while expressly superseding the earlier notification No. 17/2002-Central Excise (NT) dated 13th May, 2002, subject to a saving for things done or omitted before such supersession.