Why does the Item Code not show in the PO PDF? ← 5. ApprovalMax for Xero If you use ApprovalMax for the Purchase Order creation, approval, and dispatch to the supplier, you'll probably want to see the Item Code in the corresponding PDF file. However, there is no Item Code field in the default PDF template. To add it, go to the Xero Invoice settings and tick the checkbox 'Show item code'.Then save your changes.