Import PO and Receipts from External System

We are in the process of automating the procurement to receipt process in JDE once we get the delivery of the product in an external system.

Per my understanding, we can use the Inbound Purchase Order (P4311Z1) to import the POs from the external system. And then we can simply receive the PO using  Purchase Order Receiving (Inbound 861)(R47071/P4312/F47071/F47072). Since for external haulers we are using landed cost, the PO will be populated with the correct cost rule. And since for the inter company hauler we use inbound shipment (JDE Transportation module's Routing), the PO will be populated the mode of transportation and carrier before running the R4311Z1I program.