Shipment Receiver receives shipment. It has invoice tucked into it. Receiver records vendor name, vendor contact, amount due, invoice due date and terms. Receiver records all items received, quantity of each item, and unit price. Receiver also records tax and shipping charges as in invoice.
Information is recorded on AP invoice. Inventory QOH is increased. Inventory account is debited. Accounts Payable account is increased by amount of the bill.
If no invoice but only packing slip is received, receiver does not record money part of transaction. Later when Invoice is received from vendor accountant updates AP invoice.