Bulgaria - 1991 Constitution

Title Article 95
Chapter 4 - President of the Republic
Article

95

(2) The President and the Vice President shall not serve as Members of the National Assembly or in any other state, public or economic activity, nor shall they participate in the leadership of any political party.

Amendment Constitution: Article 95 (1990)
Categories - Extra-parliamentary party (Members' compatibility)
Source Bulgarian National Gazette and own translation