Actually, CHA has got a general practice of claiming drawback at the time he files shipping bill, so as per norms both Drawback & GST Refund can't be claim at the same time. So if you want GST refund in a quick then kindly ask your CHA to file Drawback free shipping bill, else GST RFD 01 filed by your CA would be in vain. A lot of painstaking efforts has to be made to bring the refund in this case, the government will give GST refund but after deducting the drawback amount paid priorly.