Address information, back orders

We seem to have a problem with back orders and the address.

This is the scenario:

When customer " A " ordered the product “00201” in 2012 it was a kept as a back order cause their was no stock available.

When that item “00201” arrived 2 years later the customer “A” had changed his delivery address however the back order for that customer kept the original address that was accurate at the time of the back order, thus when this is picked and updated it goes to the original address which is wrong it’ll need to go the to updated address.

Is their any functionality in AX to help us, that if a customers address is changed then we are notified that their is back order for this customers with a different delivery address ?

There is nothing as standard because when the sales order is loaded the delivery address is written to the header and you have the option to change it, therefore it is assumed through the confirmation process that you have agreed with the customer where the delivery point is. If ALL delivery addresses change you would need to review open orders and then update the delivery address as required for each order.