Changes in the Order
If any changes are made to the dates or quantities in the operation or in the component, the system automatically adjusts the data in the purchase requisition.
An indicator on the external processing screen of the operation and the Purchasing screen of the component informs you of whether a purchase order has already been created via the purchase requisition.
If a purchase requisition has already been converted to a purchase order, the indicator Purchase order exists is set on the tab page External processing in the order. Changes to the order are not copied to the purchase order.