Explanation
When you enter a supplier invoice for a purchase order that has already been delivered, you can use the following documents as a reference:
Delivery note, which is a document issued by the vendor that confirms the delivery of goods and contains information such as delivery date, quantity, and weight.
Goods receipt, which is a document posted by you that records the receipt of goods from a vendor and updates the stock and inventory data. References: SAP S/4HANA Sourcing and Procurement | SAP Learning, Course S4515, Unit 1, Lesson 1.