One option would be to create deliveries only for orders that you want, VL10B has a selection screen to enter PO numbers.
I feel there is a bigger gap in the design in general, what do you do with information that is not correct? If an order cannot be fulfilled then the delivery date has to be changed so that all parties who look at MD04 for example can know when they can really expect the goods. I could not get any valuable information from such transactions if I see there countless old orders with delivery dates in the past. You have a transaction V_V2 to reschedule orders, make use of it.
