Can. 1427

§1. If there is a controversy between religious or houses of the same clerical religious institute of pontifical right, the judge of first instance is the provincial superior unless the constitutions provide otherwise; if it is an autonomous monastery, the local abbot judges in first instance.

§2. Without prejudice to a different prescript of the constitutions, if a contentious matter arises between two provinces, the supreme moderator will judge in first instance either personally or through a delegate; if the controversy is between two monasteries, the abbot superior of the monastic congregation will judge in first instance.

§3. Finally, if the controversy arises between physical or juridic religious persons of different religious institutes or of the same clerical institute of diocesan right or of the same lay institute, or between a religious and a secular cleric or lay person or a non-religious juridic person, the diocesan tribunal judges in first instance.