law: 12. Power to make rules.-
  (1) The Central Government may, by notification in the Official Gazette, make rules to carry out the purposes of this Act.
  (2) In particular and without prejudice to the generality of the foregoing power, such rules may provide for-
  (a) the kinds of leave that may be granted to a sales promotion employee 2[, the limit up to which he may accumulate earned leave, the limit up to which he may avail of earned leave at a time and the reasons for which such limit may be exceeded, the conditions and restrictions subject to which he may be entitled to cash compensation] under section 4;
  (b) the form of the letter of appointment to be furnished under section 5;
  (c) the registers and other documents to be kept and maintained under section 7 and the manner in which such registers and other documents may be kept and maintained;
  (d) any other matter which has to be, or may be prescribed.
  (3) Every rule made by the Central Government under this Act shall be laid, as soon as may be after it is made, before each House of Parliament while it is in session, for a total period of thirty days which may be comprised in one session or in two or more successive sessions, and if, before the expiry of the session immediately following the session or the successive sessions aforesaid, both Houses agree in making any modification in the rule or both Houses agree that the rule should not be made, the rule shall thereafter have effect only in such modified form or be of no effect, as the case may be; so, however, that any such modification or annulment shall be without prejudice to the validity of anything previously done under that rule.