Comment 38 for bug 527938

@kissaki :

Yes, unfortunately, the entry points for database functionality within the application suite is spread everywhere and not just in the Base module, but the Base module kind of pulls them altogether. Without it, the database things work rather unpredictably in my experience, or even not at all. If you want to use database functionality in LibreOffice, you have to install the Base module. However, I do agree that if you do not install the module, you should not be able to see the Bibliography database at all.

Alex