court_position_generator_pickable_trigger

court_position_generator_pickable_trigger = {
	$EMPLOYER$ = {
		OR = {
			can_employ_court_position_type = $POS$_court_position
			employs_court_position = $POS$_court_position
		}
		trigger_if = {
			limit = { scope:only_empty ?= flag:yes }
			NOT = { employs_court_position = $POS$_court_position }
		}
	}
	NOT = { has_court_position = $POS$_court_position }
	trigger_if = {
		limit = { liege ?= $EMPLOYER$ }
		can_be_employed_as = $POS$_court_position
	}
	trigger_else = {
		$POS$_validity_trigger = { EMPLOYER = $EMPLOYER$ }
	}
	trigger_if = {
		limit = { exists = var:target_court_position }
		NOT = { var:target_court_position = flag:$POS$ }
	}
	trigger_if = {
		limit = { exists = var:second_court_position }
		NOT = { var:second_court_position = flag:$POS$ }
	}
	trigger_if = {
		limit = { exists = scope:eunuch }
		NOT = {
			$EMPLOYER$ = {
				any_court_position_holder = {
					type = $POS$_court_position
					is_close_family_of = scope:eunuch
				}
			}
		}
	}
}

As written in game/common/scripted_triggers/00_court_position_triggers.txt.