When making payment schedule at the moment a date is required for each payment. As a tradesman it would be good to have a date due on the first schedule and be able to have the option for the last payment saying 'on completion' as a final date may not be foreseen. It would also be great to be able to generate extra part payment schedules as the job progresses.
Also when altering the amount and or percentage of the installment the remainder amount should be automatically calculated and prefilled.
I am expecting (as i have not used this as yet but are in the process of sending one) that when the part payment is made and applied to the invoice the outstanding amounts will be calculated automatically and listed on the invoice and due dates will also work with the 'overdue invoice tab'