Art.3. If, in cases where the State or a public entity has an obligation to make compensation for a damage in accordance with the provisions of the preceding two Articles, the State or the public entity charged with the matters of the appointment or supervision of the public official in question or of the establishment or management of the public installation in question, is different from that which defrays the salary, allowance or other expenses of such public official or the expenses necessary for the establishment or management of such public installation, then the latter shall also be under obligation to make compensation for the said damage.