Pension payable to employees to be determined on rules existing at time of retirement: SC

Employee pension claim: The pension payable to an employee upon retirement shall be determined based on the rule prevailing as on the date of retirement and not that which existed on the date of entering service. 

source https://www.jagranjosh.com/current-affairs/employee-pension-to-be-determined-on-rules-existing-at-time-of-retirement-sc-1638428050-1