To my knowledge, for the sale order number, there is the field source_document in account.move.line that you can show in the form view or in the report. Regarding the delivery number, it is more complex; because from the account.move.line you need to go to the sale.order.line and from the there you need to get the stock.move and then get the field "reference" of each line. I am not a developer, but as far as I know you need to write more loops to get the list of the stock moves.