Section 4(5)(b) in The West Bengal Tax On Entry Of Goods Into Local Areas Act, 2012
(b)turnover of imports relating to entry of specified goods into a local area, if it is proved to the satisfaction of the Commissioner that such goods have been purchased in the same form against a tax invoice, or invoice, or bill issued under the West Bengal Value Added Tax Act, 2003, or the West Bengal Sales Tax Act, 1994, by a dealer registered under the West Bengal Value Added Tax Act, 2003, or the West Bengal Sales Tax Act, 1994, as the case may be;