You can create purchase invoices directly from purchase orders, direct sales, or by creating sales from purchase orders and then creating invoices from sales.
When a purchase invoice is created from a purchase order, it closes the purchase order document completely or partially; if all the items of an order are transferred to an invoice, then it is said to be completely closed and if some items of an order are transferred to an invoice, then the order is partially closed. Purchase orders for which purchase invoices are created are shown in this section. By clicking on the line, you can see the purchase order document.
If a purchase invoice is created from a shipment (incoming delivery), it closes the shipment completely or partially. Shipments for which a purchase invoice was created are shown in this section. You can see the incoming delivery document by clicking on the line.
When you create a sale from a purchase order and later create a purchase invoice from that sale, it is shown as a closed document only by the sales invoice. By clicking the row, you can see the incoming delivery document.