Sections and articles must definitely have their own headings (h1-h6). But the ePub HTML files splitting policy way lead to place individual sections and articles into separate HTML files.
In this case, only sections and articles have a title. The body does not. Which is perfectly normal and allowed by ePub accessibilty techniques specification (http://www.idpf.org/epub/a11y/techniques/techniques.html#titles-002).

So far, in this specific case, ACE is indicating an "Untitled BODY" in the HTML outline. This message sounds as a warning/error, though nothing is wrong.

To fix this, would it be possible:
- either not to report any "Untitled BODY" message in this case,
- or (at least) to qualify children's titles by their element's name, i.e. [section] or [article]. Thanks to this qualifier, the human certifier will easily understand that there is actually no problem hre (without having to open the relevant HTML files to understand what is going on).

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Laurence