When you have a sales order with many lines and some of those lines are partially shipped and invoice, it can be cumbersome to see the exact qty that is still open or outstanding per line

The field outstanding qty is already used via the item card => go to field "Qty on sales order" and check the details.

It would be handy to have this column also available in the SO line.

May be also add a SO line field called 'Back Order qty'.

When there is an outstanding qty and the shipment date is before the current date, then the Back Order Qty should be the same as the Outstanding qty.

The advantage of this column is, that \you can sort on this column and see the back order qty on a large SO very fast.