11C. Correction of clerical or arithmetical mistakes.- Clerical or arithmetical mistakes in any decision or order, or errors, arising therein from any accidental slip or omission may, at any time, be corrected by the authority by which the decision or order was made either on its own motion or on the application of the aggrieved person: Provided that where any correction proposed to be made under this section will have the effect of prejudicially affecting any person, no such correction shall be made except after giving to that person a reasonable opportunity of making a representation in the matter and no such correction shall be made after the expiry of a period of two years from the date on which such decision or order was made. | 
