What are the documents required under back-to-back Form D and E?

The supporting document are as follows:

1. Original co (e.g. GSP) of the first exporting party
2. Exporter's invoice on FOB value.
3. Working sheet (applicable for partial consignments)
4. Import Permit
5. Supplier's invoice supporting the import permit
6. Inward B/L/Air waybill supporting the import permit
7. Outward B/L or Air Waybill.