You can make any changes necessary for existing POrders. To call the form for edit of purchase order click " POrders" button on the main form. From the Purchase Orders List form, you have to choose the POrder and click on the "Edit" button( or double click on the POrder row). You can change, add and remove Purchase Order information using any functions of the Purchase Order form . We don't recommend you to make any changes in a POrder after it has been sent to your vendor. You can prepare another POrder for the required adjustment.