On all screens where you are able to release a purchase order, when you release that order the system will check each purchase order item to see if the user logged in has the authority to release that item. If the user has insufficient authority on ANY of the items, the entire purchase order cannot be released and an appropriate message will be displayed. If the user releasing the order has sufficient authority for all items on the purchase order, the order will be released without any messages, per the standard xTuple system.