On Backorder quantity does not match the Orders tab in Item Maintenance

The "On Bk Ord" quantity is a total of all sales orders with an order type of "Back Order" and the quantitiy in the Back Ordered column on the sales order.

Once a sales order is invoiced with backordered lines, it will change to a backordered sales order and the quantities will appear in Item Maintenance in the On Bk Ord column.

DocLink: Quantities are incorrect for PO, SO or WO in Item Maintenance and Item Inquiry