If you pass a forbidden value into an mt_metadata object that has a controlled vocabulary, the error message tells you that
the value is not one of the expected vaues, but it does not tell you the name of the property that the error is associated with.
If you pass a forbidden value into an mt_metadata object that has a controlled vocabulary, the error message tells you that the value is not one of the expected vaues, but it does not tell you the name of the property that the error is associated with.