Section 103. Repeal of resolution by board

Not less than twenty days prior
  to the election at which a  resolution  is  to  be  voted  upon  by  the
  electors  of  the  county  for  approval  or  disapproval,  the board of
  supervisors may, except as otherwise expressly provided  in  subdivision
  four  of  section  one  hundred  one,  reconsider its action thereon and
  repeal such resolution, whereupon the proposition for its approval shall
  not be submitted at such election, or, if submitted,  the  vote  of  the
  electors thereon shall be without effect.