Allowing vendors to Upload Purchase Invoices against Purchase Order

Allowing vendors to Upload Purchase Invoices against Purchase Order

Work Flow: Once Project is executed, We send Purchase order to every Vendors asking them to Share the invoice against the same. Most of the time Vendors Send invoices through Mails but our Finance Team miss to book those Purchase Invoices in Zoho Books. 

The Issue is - When vendors follow ups for Payments, Our finance team says invoices not booked which leads to Dissatisfaction amongst vendors and they stops working which is a Revenue Loss. 

Solution Required: An Automated Solution where Vendor has the option to Upload the invoice against every Purchase Order. That invoice needs to be approved from our finance team to book in Zoho Books. Also a Report/process/function where we can audit, How many invoices are uploaded by our vendors but not Booked by Accounts Team in Zoho Books.