A deleted Purchase Order goes into Trash, which can be accessed through the Trash button.

It is located beside the PDF & CSV Downloads in the PO Index.

You will be brought to the Audit Trail of the deleted PO's, once you click on the Trash Bin icon. The index will display all the Purchase Orders that have been deleted in the last 60 days.

There is an option to restore the PO by clicking on the orange icon (see image below)

The PO will remain in the Audit Trail Index for 60 days before auto deletion, unless it is permanently deleted by manually clicking on the red bin icon.

Deleted PO's will not hold or retain any of the previously associated invoices or delivery documents, it is just the PO that you would be restoring.