guidelines for engaging paid substitutes against leave/absentee gr d/postman staff

div heads should engage paid substitutes (gds) against the vacant/absentee/leave post of gr d/postman in deptl post offices having a combined staff strength exceeding four gr d/postman for a period not exceding ninety days. however the permission of head of region is mandatory if the engagement of the paid substitute against the vacant/leave/absentee postman/gr d exceeds ninety days.