Decisions by the council of a public establishment for inter-municipal cooperation with its own tax system, the effects of which affect only one of the member municipalities, may only be taken after obtaining the opinion of the municipal council of that municipality. If this opinion has not been given within three months of the community’s proposal being forwarded, it is deemed to be favourable. Where this opinion is unfavourable, the decision is taken by a majority of two-thirds of the members of the council of the public establishment for inter-municipal cooperation.