Game concept
Local Arbitration
The game also links it as Local Arbitration Decision.
From the game's encyclopedia
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Local Arbitration is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Decision that lets a character improve a County in their current location." It is part of Decision. The game also links it as Local Arbitration Decision. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
for a guide, post or blog
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.