Pick Pack Manager - change Priority

Hi

I want to use the BP Priority field to assign a delivery run for a customer. 95% of the time the customers who own shops never change their delivery route therefore I can use the Pick /Pack Manager to create Picking lists for individual truck deliveries every day.

However, on the odd occasion, the customer changes their mind and has goods delivered to their home address/ thus a different truck and different Priority/Run.

I've tried using a FS to bring Priority / Run through to SO and changed but the Pick /Pack Manager pulls data from the BP Master and this didn't work.

We have Boyum to use if required.

Has anyone done this easily before or do I have to resort to either manual change or SDK???

Marilyn