Dear Experts, We have imported goods under Advance authorization during the year 2019-20. Now due to non fulfillment of export obligation, we are paying customs duty involved in the above imported goods. Payment of customs duty will be on customs challan by mentioning import bill of entry number, date and other details. Can we claim ITC of IGST involved in the said shipment on Customs Challan. It will be manual payment to Customs on challan and will not reflect the said amount in GSTR-2A and 2B.