You can view the documents that are closed by the outbound delivery and the documents that close the outbound delivery in the following sections of the "Document Links" tab.
This Document Closes Those Documents
You can create delivery from sales orders. When a delivery from a sales order is made, it closes the sales order document completely or partially; if all the items of an order are transferred to a delivery delivery, then it is said to be completely closed and if some items of an order are transferred to a delivery delivery, then the order is said to be partially closed. Sales orders for which a delivery delivery has been created are shown in this section. You can see the sales order document by clicking on the line.
This Document Has Been Closed By Those Documents
The tracking for the outgoing delivery can be a sales invoice. When an invoice is created from an outgoing delivery, the invoice is listed under this section. By clicking on the line, you can see the document that closes the delivery.