For subcontractor invoices that relate to more than one service, the percentage approved figures per service should be recorded so that Projo can correctly calculate how much payment is still to be expected to the subcontractor in the future (subcontractor payment plan). The interface provided for this purpose is firstly very hidden and secondly not self-explanatory. Benefits listed in red and the total payment amount are relevant here.

In order to be able to use the interface for simple invoice verification and also to be able to easily determine the payment amounts for the individual services, we would need at least one additional column that shows the “calculated sum to be paid” per service based on the difference in performance.