Fikrul Arif, thank you for reporting this and helping make Ubuntu better. This is reproducible in Xubuntu Raring. However, if you choose 9 instead of 10, it preserves the number instead of changing it to 1. If you attempt to put a number >= 11 it will auto reset to 10 in the combobox.
As well, in Microsoft Office Professional Plus 2010 Word Version 14.0.6023.1000 (32-bit) if one highlights a word -> clicks References -> Table of Contents -> Insert Table of Contents... -> combo box Show levels: type 10 and a window pops up noting: Microsoft Word The number must be between 1 and 9. Speculatively, it appears LibreOffice would have wanted to change the logic so that instead of a number >= 11, it would be >= 10?! Despite this, the issue you are reporting is an upstream one. It would be nice if somebody having it could send the bug to the developers of the software by following the instructions verbatim at http://wiki.documentfoundation.org/BugReport . If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about the status. Thanks in advance. Helpful bug reporting tips: https://help.ubuntu.com/community/ReportingBugs lsb_release -rd Description: Ubuntu 13.04 Release: 13.04 apt-cache policy libreoffice-writer libreoffice-writer: Installed: 1:4.0.2-0ubuntu1 Candidate: 1:4.0.2-0ubuntu1 Version table: *** 1:4.0.2-0ubuntu1 0 500 http://archive.ubuntu.com/ubuntu/ raring/main i386 Packages 100 /var/lib/dpkg/status Status -> Triaged Importance -> Medium ** Changed in: libreoffice (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1159835 Title: Index entry for Table of Contents (TOC) level 10 backs to level 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1159835/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs