M. Ameller defined incompatibility as “the rule that prohibits members of parliament from engaging in certain occupations during their term of office…Its object is to prevent members from becoming dependent upon either public authorities or private interests. But the rule operates in a less direct way: it does not prevent a member from being a candidate, nor can the validity of an election be questioned on that account. But a member must choose within a predetermined period, which is generally short, between membership and the occupation that is held to be incompatible with it”.