Steps to reproduce:

• Open http://test.musicbrainz.org/edit/relationship/create_url?entity=aeae24f1-e49a-42ae-b294-b50e94a2e40a&type=release
• Select "creative commons licensed download"
• Enter a URL which is automatically matched, e.g. http://www.amazon.com/foo
• Notice that the relationship type changes, but the license attribute is still shown.