The heading row is where you enter or select a purchase order number. The information regarding the supplier code and supplier name of the purchase order will appear once you select a purchase order number.
Once you load the purchase order number you will see all order rows under the Rows tab, as well as a window where you can choose to arrival report all order rows. Under the Main tab you can see the information of the order header.
At the far right of the heading row, you will see a speech bubble if a message has been registered for the supplier in the Update Supplier procedure. This message will open when you enter the supplier code. However, you can also open the message by clicking on the speech bubble.