Taxable service classification revised: notification reference substituted to redefine which services fall within service tax scope. Amendment substitutes the prior reference to the taxable service provision in Notification No. 6/99 with a different clause-based reference within the charging provision, thereby modifying which services are treated as taxable under that notification; the change is effected by exercise of powers under the Finance Act and takes effect from the stated commencement date in August 2002.