I have had the exact same problem as Azman did, and he found the solution and described it here [1]. After reading his post I’ve decided to take the shortcut and install the xmlindent package first. So here is my approach:

# cp FILE.ods BACKUP_FILE.ods
# unzip -p FILE.ods content.xml | xmlindent > content.xml
# vim content.xml
# zip FILE.ods content.xml


Thanks Azman, it helped me a lot!

[1] http://blog.my1matrix.org/2011/12/libreoffice-tragedy-corrupted-ods-file.html