Section 6-29-4 - Service while engaged in professional improvement leave with or without pay(a) For the purpose of section 88-51(6), HRS, leaves of absence for professional improvement shall include leaves of absence for educational and sabbatical purposes.(b) Any change of a leave of absence to any of the foregoing types of leave shall be recognized as purchasable service only if approved by the head of the department from which the leave of absence was taken. [Eff 2/9/89] (Auth: HRS §§ 88-28, 88-51, 88-59) (Imp: HRS §§ 88-51, 88-59)