Failure to read MusicXML file

Hi,

MuseScore refuses to read the attached MusicXML file (created by Rosegarden):

$ mscore
registerPlugin: add action idx 3
Load plugin: no menu property
preferences.checkUpdateStartup: 720
lastupdate: 28.06.2011 07:29:22.766
KGlobal::locale::Warning your global KLocale is being recreated with a valid main component instead of a fake component, this usually means you tried to call i18n related functions before your main component was created. You should not do that since it most likely will not work
Import MusicXml:xmlScorePart: cannot find part B

Maybe the file contains invalid XML (I'm not an MusicXML expert). Still, it would be nice if MuseScore just
printed a warning message on the missing part B (and part C up to part LL) and processed part A.
A work-around is to manually delete the lines between

<score-part id="B">
<part-name></part-name>
</score-par>

and

<score-part id="LL">
<part-name></part-name>
</score-part>

System info:
OpenSUSE 11.4
Qt Version 4.7.1
MuseScore: Music Score Editor; Version 1.0; Build 3996

Thanks
gb7