open order & back order

back order process in IDES:
Sales Processing according to ATP logic and Backorders
http://help.sap.com/saphelp_46c/helpdata/en/e6/4a86da9e0311d189b70000e829fbbd/frameset.htm

'open order' is all orders that have not been deliveried or partially deliveried.
if order have not been confirmed or partially confirmed, or have been confirmed, but
up to customer's request delivery date, it have not been deliveried, system also
recognize it as 'back order'.
In a word, 'back order' must be 'open order'.

"Backorder list will include :

1. Sales Order Item which is not fully confirmed
2. Sales Order Item with requested delivery date which can not be kept

This backorder only valid with material which has an individual requirement which is
defined in availability check field (checking group) in material master MRP 3 view.

TCODE V_RA is a manual backorder processing means that all list of incomplete sales
order will be presented for the selected material and plant.

TCODE V.15 is a backorder list which include all sales order which is not fully
confirmed and which is late for delivery. "