(1.) In all these writ petitions, the validity of the first proviso to sub-section (1) of Section 19 as well as sub-section (2) of Section 21 of the Andhra Pradesh General Sales Tax Act, 1957 as substituted by Act No. 8 of 1997 with effect from 4-1-1997 is questioned on various grounds.
(2.) Since a common issue is raised in all these writ petitions, they are being disposed of by the following common order.
(3.) Sections 19 and 21 of the Andhra Pradesh General Sales Tax Act, 1957 (for short "the Act") deal with the provisions of appeal before appropriate authorities.