We used ACS in the past and their system was able to warn you if you were entering a duplicate invoice. FENXT does not warn you but allows you to enter and pay an invoice with the same number to the same vendor. There's no flags at all to let you know you've made a duplicate payment.

A vendor will sometimes submit an invoice to multiple people to let them know to pay it but when both employees enter the same invoice and have different approvers, no one knows that they are being duplicated. Even AP will see that invoices are approved and ready to pay but will not catch that there has been multiple entries because one was entered one week while another employee entered it again the following week. But in Expense Management, the employee can only see what they have entered, not someone else so they are non the wiser.