Incompatibility rule


Incompatibility rule is a regulation issued by a group of people that prohibits simultaneous membership in this group and other groups. Such conflict usually represents an obstacle to admission to the group or a cause for expulsion. For example, the members of parliament in many countries are prohibited from engaging in certain occupations.

Parliamentary incompatibility

Most countries impose some restrictions regarding outside occupations of the members of parliament. Some restrictions come in the form of ineligibility, disqualifying a candidate. In other cases, the candidate with a potential incompatibility is allowed to run in the election, yet in case of an electoral success has to make a choice between their occupation and membership.
The lists of occupations prohibited to parliamentarians vary by country, but frequently include:

Germany

Germany has a long tradition of incompatibility resolutions issued by its parties: Communist Party of Germany adopted an incompatibility resolution against the left-wing International Socialist Youth League already in 1922. ISYL members moved on to Social Democratic Party of Germany, and SPD followed with its own resolution in 1925. The compilation of these resolutions for a particular party is also known as an incompatibility list,.