Interstate sales but delivery to sez

This issue is a bit doubtful. Sub sec 6 of Sec8 of CST Act 56 allows exemption on sales made to aunit located in a special economic zone. But, here you are selling to another dealer who is not in SEZ. He may, on the way, sell by  transferring  the documents to his customer of SEZ. An E1 sale can be done,but, the provisions of Sec8(6) do not apply. Therefore, you have to charge CST as per rules in the invoice....mjk