 A number of separate supranational groupings of countries exist, and membership in some of these groupings may involve multinational agreements and treaties in which member countries agree to some degree of reciprocity regarding voting rights.Some individual countries are members of more than one supranational groupings, and some supranational groupings of countries are members of other supranational groupings of countries.The 1992 Maastricht Treaty imposed reciprocity inside the European Union concerning voting rights in local elections; this already existed for the European elections.