What's a back-to-back purchase order?

An order to procure product from an external supplier to fulfill a back-to-back sales order.

Oracle Supply Chain Orchestration automatically reserves the back-to-back purchase order against the associated back-to-back sales order. When the purchase order is received and put away at the destination location, the supply-side of the reservation automatically moves from the purchase order to the new on-hand inventory. This action maintains the reservation of the supply against the back-to-back sales order until shipping.