Form h or form i?

To prove that a particular sale is made to other country, ie., Export Sale, one should produce bill of lading, purchase order, packing list, sale invoice and some times bank statement on the payment received. Form-I is required on the sale made to other state SEZ and Form-H is required in case of a sale made to an exporter. Some times assessing authority may insist bill of lading copy against which the Fomr-H is issued.