With a view to rectifying any mistake apparent from the record, the competent authority may amend any order made by him under this Chapter at any time before the time for presenting an appeal against such order has expired, either on his own motion or on the mistake being brought to his notice by any person affected by the order :

Provided that if any such amendment is likely to affect any person prejudicially, it shall not be made without giving to such person a reasonable opportunity of being heard.