I have an aggregated order of Pharma APIs and am a Merchant exporter. Is it compulsory for me to buy the goods from Manufacturers with .1% GST as I have to submit all my trade value data to supplier through Shipping bill. Can i buy with 18% GST and claim input credit in GST return ? I will execute the LUT for the export. Two supplier/manufacturer have asked to revise my PO to .1% and other 2 have taken at 18%.