Alternative licensure and tenure?

    I am in my third year of teaching; the first two years, I
    taught on an alternative license. I advanced to an
    apprentice license last summer. My question is: on my
    evaluation paperwork, the "recommended for tenure" box was
    designated "NA." Is tenure only applicable after completing
    three years' service on an apprentice license, or should my
    two years of service on the type II alternative license
    apply as well? I want to make sure that a mistake has not
    been made here. Thanks!