Not obeying one way relationships

Hi and thanks for this module.
I'm using the api in my site to create student/teacher relationships. I've created the Student relationship and marked it One Way. When I make the following call:

user_relationships_request_relationship(&$student, &$teacher, &$studenttype, $approved = TRUE);

And then look at the student's relationships, I see them listed as a student of teacher as expected, but when I look at the teacher's relationships, I see them listed as a student of the student. Shouldn't the One Way selection for the Student relationship type stop the teacher being considered a student of the student?

Thanks,

Doug Gough