change_to_administrative_effect

change_to_administrative_effect = {
	save_scope_as = governor
	if = {
		limit = { exists = scope:new_liege }
		scope:new_liege = { save_scope_as = governor_liege }
	}
	else = {
		top_liege = { save_scope_as = governor_liege }
	}
	# exactly 0 treasury,  i.e. newly get this feature
	if = {
		limit = {
			OR = {
				has_treasury = no
				treasury = 0
			}
		}
		save_scope_as = new_treasury
	}
	# Set the correct government
	if = {
		limit = {
			OR = {
				NOT = { government_has_mechanic = administrative }
				AND = {
					scope:governor_liege = { government_has_mechanic = administrative }
					government_type != scope:governor_liege.government_type
				}
			}
		}
		# Only case where Estate type is shared between Admin and non-Admin
		if = {
			limit = {
				NAND = {
					government_has_flag = government_is_japan_feudal
					scope:governor_liege = { government_has_flag = government_is_japan_administrative }
				}
			}
			save_scope_as = new_admin
		}
		# If we are greek, let's ensure we become administrative
		if = {
			limit = {
				NOT = { exists = scope:has_selected_a_government }
				scope:governor_liege = {
					this = scope:governor # not vassal of some other admin liege
					culture = {
						OR = {
							this = culture:greek
							any_parent_culture_or_above = { this = culture:greek }
						}
					}
				}
			}
			save_scope_value_as = {
				name = has_selected_a_government
				value = flag:administrative
			}
		}
		# Change government
		# We first check if you have a selected government, then if you are independent, then what your liege has
		if = { # Ritsuryo
			limit = {
				trigger_if = {
					limit = {
						exists = scope:has_selected_a_government
					}
					scope:has_selected_a_government = flag:japan_administrative
				}
				trigger_else_if = {
					limit = {
						top_liege = this
					}
					has_tgp_dlc_trigger = yes
					tgp_can_become_japan_administrative_trigger = yes
				}
				trigger_else = {
					scope:governor_liege = { government_has_flag = government_is_japan_administrative }
				}
			}
			change_to_administrative_holding_effect = yes
			tgp_domicile_conversion_when_changing_government_type = {
				NEW_DOMICILE_TYPE = japanese_manor
				NEW_GOVERNMENT_TYPE = japan_administrative_government
			}
			change_government = japan_administrative_government
		}
		else_if = { # Celestial
			limit = {
				trigger_if = {
					limit = {
						exists = scope:has_selected_a_government
					}
					scope:has_selected_a_government = flag:celestial
				}
				trigger_else_if = {
					limit = {
						scope:governor_liege ?= this
					}
					has_tgp_dlc_trigger = yes
					OR = {
						tgp_can_become_celestial_trigger = yes
						#This is Mongol breakup and they are hegemon
						AND = {
							exists = scope:great_yuan_ruler
							this = scope:great_yuan_ruler
							primary_title = title:h_china
						}
					}
				}
				trigger_else = {
					scope:governor_liege = { government_has_flag = government_is_celestial }
				}
			}
			change_to_administrative_holding_effect = yes
			tgp_domicile_conversion_when_changing_government_type = {
				NEW_DOMICILE_TYPE = east_asian_estate
				NEW_GOVERNMENT_TYPE = celestial_government
			}
			change_government = celestial_government

As written in game/common/scripted_effects/00_administrative_effects.txt.