GIFT VOUCHER GIVEN AS PROMO GETS DEDUCTED AT ITEM LEVEL
FOR EXAMPLE, THE PROMO IS: ON PURCHASE OF RS 1500 GET A GIFT VOUCHER WORTH RS 500 WHICH IS REDEEMABLE ON THE NEXT PURCHASE OF RS 1500
AS PER THE CURRENT SYSTEM THE NET SALE VALUE OF THE NEXT PURCHASE BILL WOULD BE 1500 AND GST WOULD BE PAYABLE ON ...