You can only edit a change package with a status of New in the Change Perspective, which means it has been saved but not yet committed. This procedure assumes you have already saved one or more change packages that will be visible in Change Perspective of the target view in which it resides.
When a change package is opened for editing, the only item-level changes allowed are changing View Compare/Merge action types such as marking a difference as ignore, and resolving merge conflicts, for example, manually merging properties or file contents.
The only non-item edits allowed are: the change package's Name and Description properties, Pre-and Post-Comment Revision and View Label options, the change package's' Revision Comment which is used when the change package is saved or committed, the change package's Working Folder, and the change package's Default Comment which is used as the revision comment for any new item revisions created during commit.