Changing Objects and Completing Changes
Once you have converted the change request to a change order, you can edit the change objects with reference to the change number that identifies the change order.
When you have finished changing the object, you must set a new status in the change order.
To complete a change:

Only after the status Complete change has been set for all change objects can you complete the change order.
Exception for documents:
For documents, the processing status Complete is not set in the change master. For each document type, you define when a document is complete in terms of Engineering Change Management via the document status (see the IMG for the Document Management System, under Document status).
If you want to set the Complete status while editing the document, the system checks the object management record of the document in the allocated change master. The document can only receive the status if the current system status has Release change as the subsequent system status. In this case, the management record is automatically changed in the change master, and the system status is set to Release change.
Otherwise the document cannot receive a status which is complete in terms of Engineering Change Management.
– Set the system status Error in change in the object management record of the appropriate change object.
– Edit the incorrect object (for example, BOM)
– Set the system status Errors corrected in the object management record of the appropriate change object.

When you save the ECR, the ECO is released. As of this point in the processing procedure of the change master record, you can no longer edit change objects with reference to this change number.