At the time of reconciling order from delivery pending section items can be added in Back Order.

For adding items in Back Order follow below steps :

1. Open receiving pending module.
2. Open any of order.
3. The select item which you want to add inBack Order until you don’t select an item, Back Order button will not enable.
   
   
4. After successfully add in Back Order confirmation will display.
5. Multiple items can allow to added in Back Order simultaneously.
   
   
6. Open Back Order from Generate order module.
7. Item will be listed in Back Order.