Hi Rajiv,
This is according to my knowledge
If it is stock order ( MTS ) as given below, It will not display in COOIS with respect to sales order/item.
If it is Sales order (MTO) as shown below, then it will display the result in COOIS with respect to sales order/item
Check Planned order box and enter ur sales order number form second case (MTO) it will display the related planned order.
Thanks,
Vishal