Lithuania - 1992 Constitution

Title Article 83
Chapter 6 - The President of the Republic
Article

83

(2) A person elected President of the Republic must suspend his or her activities in political parties and political organizations until a new presidential election campaign begins.

Categories - Extra-parliamentary party (Members' compatibility)
Source Gisbert H. Flanz ed. 2004. Constitutions of the Countries of the World. Dobbs Ferry, New York: Oceana Publications.