Display of tax & Freight in a standard PO

This entry is a mix of discussion & questions. Most of the time, Purchasing process for a typical company includes tax and freight. In Oracle Receivables, there are separate fields to display invoice total, tax total, charges and freight which makes perfect sense. There is a similar structure for Order Management Sales Orders. But on a standard Purchase Order, only total of the Purchase order is displayed at header level without tax and freight info. Considering that every standard Purchase Order is another company's (vendor) invoice, this does not make sense at all. In my opinion, this is a serious