Difference between back to back order and drop ship order

Drop shipment is similar to this back to back process in that your sales order. Line creates a requisition line that becomes a po sent to your supplier. In a drop shipment however you instruct your supplier to send the item or configured item directly to your customer. The item never physically pass through your warehouse & therefore you do not pick, pack or ship them yourselves. In the back to back scenario, you instruct your supplier to send you the goods and then you ship them on to your customer.