On perusal ol abovepara of thecircular,it is clearly expressedthat (i) GST is self assessed which mcans ifa taxpaycr/supplieris claiming exemptior/concession under any notification issued under CST Act,he has to satisly himselfthat he fulfillsthe mandatory conditions for claiming thcsame,onus to provethat he is eligible for such exemption/concession lies on thatlaxpayer, and (ii) the rvords used in abovepara of circular"...he need to satisfyhimself with the requisitedocument froma buyer such as supply contracts/order..."provides cxamples, using word'such as', of documents required lrom buyer, for satislhctionof taxpayer that goods arc indeed used in WTEP. Therefore, we find that meaning olabove para cannotbe construed to includeonly .supply contracts/order' but it will include all such docurtents rvhich can satisry the supplier regarding usage olthcirgoods by theirbuyers.In the prcsentcase we find that appellant has receivedpurchaseorders No. 4500328493 dated 03.07.2020from Mundra Solar PV Limited and No.4500327829dared 17.06.2020from M./s. Adani Green Energy Ltd., for supply of Solar DC Cables.They have acccptedthe said purchase orders and as discussed above the saidpurchase orders are a valid contractbased on which the appellant can claim exemplion/concessiontbr their supplies undcr referred entryno.234.