495—8.4 (97B) Required quarters of wages on file. If a member is attempting to purchase service credit under this chapter, and any particular rule under this chapter requires that the member must have four calendar quarters of wages on file as a precondition to making the purchase, and the member’s regular job duties are performed in fewer than four calendar quarters each year, the four-calendar-quarter requirement shall be reduced to the number of calendar quarters regularly worked by the member.