Two or more persons may sue or be sued as co-parties under the following subparagraphs:
1. When the administrative disposition in relation to the claim was rendered jointly by two or more government agencies;
2. When the rights, obligations or legal interests of the claim are common to them;
3. When the rights, obligations or legal interests of the claim arise from the same or same types of factual or legal grounds;
For the joint litigation arising from the same types of factual or legal grounds as prescribed in Subparagraph 3 of the preceding Paragraph, it is required that the defendant's place of domicile or residence, the office of official duty, the government agency, the principal office or principal place of business locates within the jurisdictional boundaries of the same administrative court.

Unless otherwise provided, in a joint litigation, an act conducted by a co-party or by the opposing party against one of the co-parties, and all matters concerning such co-party, will have no effect on the other co-parties.

Wherever a claim must be adjudicated jointly with regard to all co-parties, the following subparagraphs shall apply:
1. Any act conducted by one of the co-parties in the interest of all co-parties will be effective with regard to all of them; any act conducted by one of the co-parties against the interests of all co-parties will have no effect with regard to all of them.
2. Any act conducted by the opposing party against one of the co-parties will be effective with regard to all of them;
3. Any party of the co-parties, who has reason for a stay of proceeding, either by operation of law or by a court ruling, that arises with regard to one of the co-parties, will take effect with regard to all of them.

Each co-party has the right to continue the litigation.
Prior to designating a court session, the administrative court shall notify all co-parties to appear.