Show (sub)total in Schedule

The desire is that we see the (sub)total of the entered lines within the schedule for verification. This makes it easy to check whether the total of the entered lines matches the amount for "contracted work" or whether a (typing) error has been made or something has been forgotten.

The contract amount entered is €10,000

Total amount of installment schedules is €9680

The installment schedule then shows €9,680 of €10,000