S. 12AA: Procedure for registration-Trust or institution-Charitable purpose-Cancellation of registration-Cancellation cannot be with retrospective effect-Ceasing to be charitable institution-Sale of Institution in 2017-Cancellation of registration from the date of ceasing to be charitable is held to be valid. [S. 11, 12A, 12AA(3), 80G (5), 132, 153A]