The principal and vice-principal allowances shall not be reduced for reasons of transfer from one school to another as principal or vice-principal, provided such transfer is effected at the request of the Division. Said allowance shall be protected for a period of two (2) years. In those cases where a principal or vice-principal has been placed in another position while receiving a protected allowance and benefits from a different allowance, that administrator shall be paid, from the date of such placement to another position as principal or vice-principal, the greater of the two allowances. At the end of the two-year (2) period, the allowance shall be adjusted in accordance with the corresponding allowance for the new position.