California Code, Education Code - EDC § 44897

(a) A person employed in an administrative or supervisory position requiring certification qualifications upon completing a probationary period, including any time served as a classroom teacher, in the same district, shall, in a district having an average daily attendance of 250 or more pupils, be classified as and become a permanent employee as a classroom teacher.  In a district having an average daily attendance of less than 250 pupils, he or she may be so classified.

(b) Persons classified pursuant to this section are subject to the limitations contained in Section 44956.5.