Remove reservations in preferred sequence

Situation

You come across a situation when your sales order has reservations with multiple supply sources including on hand. A typical situation may have even to extent of Sales order having WIP Job, Purchase Order, Purchase requisition and On hand reserved at once to cover the amount of item required to be fulfilled by the sales order. In case of Back to Back orders, you will be able to see the supply orders mapped to the Sales order.

However when the Sales order line quantity is reduced, the removal of reservation has to happen. Which of the supply sources to be reduced is a question.