57Admittedly, the possibility for national courts to assess the arrangements of a system of aid in the light of Treaty provisions other than those of Articles 92 and 93 presupposes that the arrangements in question can be evaluated separately, and are thus conditions or factors which, though forming part of the system of aid in question, are not necessary for the attainment of its object or for its functioning (Iannelli & Volpi, cited above, paragraph 14).