In ECC-6.0, I have a requirement of including a new list header in t-code COOIS to display the operation details of a planned order. I did the customization setting with t-code COISL by including a new list but i am not getting the output. Please let me know if we need to use implicit enhancement like LCOWORKF06? Please provide your inputs
I'm afraid your requirement sounds somewhat conceptually wrong. In order to display header and operation details together, you would need to choose PPIOA000 Object Overview with its "split screen". But as soon as you do that for order category planned orders, you will only be able to choose Order Headers and Components under Objects. This is probably due to the fact that a planned order does not "really" contain operations: lead time scheduling only creates capacity requirements based on the applicable task list.
In short, while COOIS with its BAdI WORKORDER_INFOSYSTEM is incredibly flexible, I agree with Caetano: you will need a custom development.
In the standard delivered customizing settings, there is no list for planned order operations and I don't think the standard programs were designed to handle planned order operations.
If you check function module COWB01_PLANNED_ORDERS_SELECT, which is called in COOIS to read planned orders, you will observe that there is no parameter to read the planned order operations, so they are not even read from the database.
Therefore, you will need a custom development to have planned order operations read in COOIS.