Can the ruling issued by the authority or order passed by the appellate authority be modified

In case there is any error apparent on the face of the records then the Advance Ruling Authority or Appellant Authority for the Advance Ruling, as the case may be, can amend the Original Order passed by it within a period of 6 months from the date of said Order.

(ICAI FAQ PUBLICATIONS 06-09-2017 Advance ruling under GST: FAQ NO. 15)