The Supreme Court upheld the Rajasthan High Court's decision striking down Rule 17(20) of the Central Sales Tax (Rajasthan) Rules, 1957 (Rajasthan CST Rules) as ultra vires the Central Sales Tax Act, 1956, noting that the State Government cannot exceed its delegated powers by authorizing cancellation of Form C, which the Central Rules do not permit. The bench comprising Justices Abhay S Oka...