Another controversial issue was the referendum law, based on the constitution of Serbia and Montenegro, which stated that Montenegrins living within Serbia registered to vote within Serbia should be prohibited from voting in the referendum because that would give them two votes in the union and make them superior to other citizens. Also, the agreement threshold between the two blocs for 55%, was somewhat criticized as overriding the traditional practice of requiring a two-third supermajority, as practiced in all ex Yugoslav countries before (including the previous referendum in Montenegro).