The communication of data between a Town Council and an instrumental entity has to undergo the general regime established in the LOPD (articles 11 and 21). In the suppositions in which it is not ordered of habilitation in accordance with these articles, the access to particulars that are treated under the responsibility of the Town Council on the part of an instrumental entity, through the formalization of an order of the treatment (article 12 of the LOPD), can be legitimated. It is insufficient to the effects of formalizing an order of the treatment, the substitution of the foreseen contract in the article 12 quoted by other types of instructions and orders given to the instrumental entity by the responsible, since these do not fit to the demands of the foreseen regime in the LOPD for the figure of the person in charge of the treatment, that an agreement of wills requires.