Evasion of tax--Sales tax--Penalty--Check-post--Goods in transit--Finding by Tribunal documents complete and in possession of person in charge of vehicle--Failure to report at barrier loses significance--No notice sent to consignee as required by amended provision--Levy of penalty vitiated--Punjab General Sales Tax Act (46 of 1948), s. 14B(7)(iii).--State of Punjab v. Khalsa Pulp and Paper Industries Pvt. Ltd. (P&H)