A DEFAUT DE CETTE HARMONISATION , ET AU PLUS TARD LE 31 DECEMBRE 1973 , LE CONSEIL DECIDE , A LA MAJORITE QUALIFIEE SUR PROPOSITION DE LA COMMISSION , DANS QUELLE MESURE CES DISPOSITIONS DOIVENT ETRE MAINTENUES , MODIFIEES OU ABOLIES .
IF SUCH HARMONISATION IS NOT ACHIEVED , AND IN ANY EVENT NOT LATER THAN 31 DECEMBER 1973 , THE COUNCIL SHALL , ACTING BY A QUALIFIED MAJORITY ON A PROPOSAL FROM THE COMMISSION , DECIDE TO WHAT EXTENT THESE PROVISIONS MUST BE RETAINED , AMENDED OR ABOLISHED .