Xero is an accounting app that lets you track businesses expenses and accounting with intuitive mobile apps and web interfaces for point-of-sale, ecommerce, time-tracking, and more.
Put purchase order links and line differences on bills for approval.
Your approver sees the purchase order link and line differences on the bill before making a decision.
Flag likely duplicate supplier bills and link earlier invoices for review.
Your AP reviewer sees a possible duplicate and its earlier invoice before approval or payment.