The vocal relationship attribute offers a number of choices for specific vocal types. One of those choices, "contra-tenor", is not like the others. "Contratenor" is a description of a musical function (not voice type) in early polyphonic music; the voice type (of a male alto, very high tenor or haute-contre) is "countertenor".

(This isn't cut and dried; a brief perusal of Wikipedia will reveal the can of worms that is naming of high male voice types. However, "countertenor" at least has the virtue of existing in a dictionary, unlike the current "contra-tenor").

I'm not logged in; I don't know if I have an account on this system. My Musicbrainz ID is "crhodes" in case this issue merits discussion.