This is a known issue. Currently Flash Builder 4 does not support XSD schemas having '-'(hyphen) in their names since it maps to AS value objects. https://bugs.adobe.com/jira/browse/FB-19662 . Please vote for the issue.
Is there any update for fix ?
I can see same issue happening on FB 4.6 /4.7, is there any other way to fix the validators in FB to support '-' ( hyphen)