SECTION 15.6   APPROVAL OF ORDINANCE BY ELECTORS PREREQUISITE TO ITS GOING INTO EFFECT WHEN REFERENDUM PETITION HAS BEEN CERTIFIED.
   When a referendum petition, or amended referendum petition as defined in Section 15.5 of this Charter, has been certified as sufficient by the City Clerk, the ordinance specified in the petition shall not go into effect, or, if it has gone into effect, further action thereunder shall be suspended until and unless such ordinance is approved by the electors, as hereinafter provided.