Subtitle for key is not found in JBoss Tools XML Editor

1. Checkout dvdstore example
2. Open dvdstore-ds.xml in JBoss Tools XML Editor (default for me)
3. douvle click on nodes in the tree
There is a properties view with "Sbtitle is not found for key "...""
Abnd for elements in other xml files which are opened by the editor (but not for all)