Do my sales conditions apply when my P.O is mentioned on the invoice? Elia Support July 02, 2021 06:13 Elia's terms and conditions will always apply even if your PO reference is indicated on the invoice. Related articles How can I make sure some people of my company receive a copy of the invoice by mail? How do I use docusign? How much does such a study cost? What is the status of my invoice? Where does it stand for? Why do I have to provide a second e-mail address when I opt for e-invoicing?