Position of the Topic in the Complete Training Scenario

The figure illustrates the position of receiving and paying in the process flow.
Scenario
You have ordered goods from a vendor. You want to receive the shipment into your warehouse.

Inbound processing can be based on purchase orders which get confirmed by the provider with an advanced shipping notification (ASN) when the goods are issued.
Based on this notification an inbound delivery can be created which are then the central document to manage the inbound process and to receive the goods into stock.
The process may or may not include an external warehouse management solution (WMS) for example SAP EWM.
In addition to the goods the vendor provides an invoice (electronically or on paper) which is typically verified before a payment is triggered.
During the invoice verification information of the goods receipt (quantity) and from the purchase order (pricing) are used as reference.
Note
Neither ASN nor inbound delivery are mandatory; goods can always be received with other or without reference.