Section 40. (1) Without prejudice to the provisions for appeal and revision under this Act, any competent author

40. (1) Without prejudice to the provisions for appeal and revision under this Act, any competent authority may, either on its own motion or on an application received in this behalf, amend any order as to the institution to which a child is to be sent or as to the person under whose care or supervision a child is to be placed under this Act. (2) Clerical mistakes in orders passed by a competent authority or errors arising therein from any accidental slip or omission may, at any time, be corrected by the competent authority either on its own motion or on an application received in this behalf.