migration_fitting_vassal_lands_effect

migration_fitting_vassal_lands_effect = {
	if = {
		limit = {
			scope:target_title.tier >= tier_$UPPER_TIER$
			any_in_list = {
				variable = obedient_vassals
				count >= 1
			}
		}
		while = {
			limit = {
				any_realm_county = {
					NOR = {
						$LOWER_TIER$ = scope:actor.capital_province.$LOWER_TIER$
						holder = { is_in_list = settled_vassal }
					}
				}
				any_in_list = {
					variable = obedient_vassals
					count >= 1
				}
			}
			create_title_and_vassal_change = {
				type = granted
				save_scope_as = change4
			}
			ordered_realm_county = {
				limit = {
					NOR = {
						$LOWER_TIER$ = scope:actor.capital_province.$LOWER_TIER$
						holder = { is_in_list = settled_vassal }
					}
				}
				order_by = {
					value = 1
					every_de_jure_county = { add = 50 }
					$LOWER_TIER$.title_capital_county = { add = county_fertility }
					if = {
						limit = {
							this = $LOWER_TIER$.title_capital_county
						}
						add = 500
					}
				}
				migration_settle_down_obedient_vassal_effect = yes
				$LOWER_TIER$ = {
					if = {
						limit = {
							OR = {
								is_title_created = no
								holder ?= {
									NOT = { is_in_list = settled_vassal }
									OR = {
										liege = scope:actor
										top_liege = scope:actor
									}
								}
							}
						}
						change_title_holder = {
							holder = scope:current_vassal
							change = scope:change4
						}
					}
				}
			}
			resolve_title_and_vassal_change = scope:change4
		}
	}
}

As written in game/common/scripted_effects/09_dlc_mpo_scripted_effects.txt.