https://www.scconline.com/blog/post/2022/05/24/vacancies-filling-up-rules-governing-state-employee-rangaiah-overruled-labour-service-law-supreme-court-judgments-legal-research-updates-news/
No universal rule to fill vacancies on the basis of the law which existed on the date when they arose; Supreme Court overrules 1983's YV Rangaiah rulingĀ