In eBweb version 14, the document's Change History topic shows all the change requests that have been incorporated over the history of the document. But in V15 it doesn't.
Known issue . This layout is missing from the Default Document View layout.
Steps to Resolve
Download  DocChgHistory.txt from this link. Rename the downlaoded file to DocChgHistory.layout.
Run Layout Editor. Select the View layout – You can do this at a specific Document Class or you can do it at the Document Root View layout.
3. Select File -> Merge with updated layout…
4. On Merge Layouts screen, select the ‘DocChgHistory.layout’ file. Check on the ‘Import new relationships’ and ‘Import into all layouts of this type’ only.
5. On the next screen you should only see the Change History relationship. Import it.
6. Then on the appropriate Sections of each layout enable this relationship.