Changing a Document and Completing an ECO 
Prerequisites
To complete a document change, the following must apply:
Procedure
– For example, change an original application file and check it into a vault.
– Set the document status that has the Complete for engineering change management indicator set for it.
The system checks the object management record of the document in the allocated change master record. If all the requirements have been fulfilled, the system automatically changes the change master record (the object management record for the document receives the Complete change system status).
After changing an object, you must set the system status of the object to Complete change.
You only need to take this step for those objects that have already been assigned the system status Change possible.

You can only complete the engineering change order once the system status Complete change has been set for all objects.
Exception for documents:
The processing status Complete is not set in the change master record for documents.
Change the system status of the change objects and the change master to Release change and Release order respectively.