4. Where the person was granted a year of leave or part of a year of leave, the contributions paid by the person during such year or part of such year shall be used to complete the contributions required to credit a year of service or part of a year of service for each other year or part of a year during which the person received only part of his salary. The pensionable salary for each of such years or any part of such year shall be the salary which would have been paid to him if he had not agreed to receive only part of it.
O.C. 1863-83, s. 4; O.C. 1773-86, s. 1.