i have come across some problem while creating ECN's in Windchill.
Here is the query, I require the Top Level Assembly part number which is in "In Work" state to "Design Release" state. While Doing this the associated sub assembly component part numbers also called and they are in "In Work" State. But i want to use the Sub assembly components in "Design Release" state, to process my top level assembly part number in ECN.
If I understood your question, you should be looking at Business Rule Configuration, specifically BOM Release Rule.
This business rule ensures that all resulting objects are at an appropriate state and all their first-level dependants are at the appropriate state. If a child object is also a resulting object, that child goes to the target state when released through the change notice, instead of staying at the current state.