V_RA - Backorder Processing ; V_V2 - Rescheduling ; V.15 - Backorder List ; OMIH - Checking rule for updating backorders; OPJL - Define new checking rule; OPJJ - Define scope of check;
Backorder processing is a functionality in SAP where you can change the committments and over-ride the blockage of stocks marked against sales documents/deliveries. For e.g. you receive an order from a very important customer for material "A" but the entire quantity of A is committed to another customer "B" via earlier sales orders and this is where BACKORDER processing helps you to change the committment and shift stock due for B to A. This is the benefit of this funtionality.