is it Compulsory relieving Letter for off roll employees

hai  nitin, the question of off roll or on roll is companies internal issue. when ever a employee joines the company his name should be entered in the company mustor roll. then as per law & company standing orders / policy all labor laws will come to applicable based on company stracture.in india all employment law says , employer should protect his employees emplyment rights as mentioned in the law, without deviating the original one. employer can provide / make extra rights or facilities without deviating basics of law. so it is the right of employee and responsibilty of emplyer to provide any letters to the employee, 

Thanks For advice????