The following .org file produces an invalid .odt file upon export to odt
because of the footnote in the footnote:

--8<---------------cut here---------------start------------->8---
#+TITLE: Footnote in footnote produces invalid .odt
#+AUTHOR: Rainer M. Krug

* A Footnote in a Footnote
Some footnote[fn:2]

* Versions
Org-mode version 8.3.2 (release_8.3.2-161-gd2ac25 @ /Users/rainerkrug/.emacs.d/elpa/24.5/org-20151005/)
GNU Emacs 24.5.1 (x86_64-apple-darwin15.0.0, Carbon Version 157 AppKit 1404.13) of 2015-11-03 on Rainers-MacBook-Pro.local
Libre Office: Version: 5.0.3.2
              Build ID: e5f16313668ac592c1bfb310f4390624e3dbfb75
              Locale: en-US (en.UTF-8)

* FOOTNOTES

[fn:2] Footnote 2[fn:1]

[fn:1] CHECK!
--8<---------------cut here---------------end--------------->8---

The odt is attached for reference.


Cheers,

Rainer