[MusicXML] Import of Harmony and Forward/Backward create corrupted file
MuseScore 2.0.2 and 95bbfdcd92 (using the pull parser, the dom one is fine)
Open this file https://musescore.org/sites/musescore.org/files/Agua%20De%20Beber%20(Am)19%20sept%20trial.xml
Check measure 40 and 42.
In MuseScore 1.3 or with the dom parser the harmonies are imported as expected.