Why it's flagged. Inspect shows how the build will sort your book into front matter, body and back matter, using your Heading 1 titles and where they fall. Warnings and notes describe what it will drop or rename, such as your own title page or contents, which the factory generates.
How serious. Usually Worth a look for a warning, Just noting for a note; a problem the map calls an error can show as Worth fixing.
How to fix it. In any editor:
- Check the map matches your book.
- To move a section, rename or move its Heading 1.
- Make every section title Heading 1.
When to leave it. If the map is what you meant, leave it: the build uses the map as shown. In the full report, correct as is stops a warning being flagged.