The cost shown within the financial overview in your cost commitment is based on the inclusion of the orders placed through the related mini markets.
All purchase orders have 3 tabs:
Purchase Order.
Delivery.
Invoice.
Cost commitment will do the following to retrieve the most up-to-date value of the order:
Use the invoice tab, if unlocked will use the delivery tab if the delivery and invoice tab is unlocked it will use the purchase order tab.