Section 64(4)(b) in Tamil Nadu Pension Rules, 1978
(b)The Audit Officer, while issuing the authorization shall retain one copy of such calculation sheet for his office record and forward the remaining such three certified copies of that calculation sheet to the each of the following persons, namely:-(i)The Pensioner along with the pensioner's half of Pension Payment Order;(ii)The Pension Disbursing Officer; and(iii)The Head of Office or Pension sanctioning authority, as the case may be.