Cases: related areas & barristers

$case_meta = array(
	'relation' => 'AND',
	array(
		'key'     => 'related_barrister',
		'value'   => '123',
		'compare' => '=',
		'type'    => 'NUMERIC',
	),
	array(
		'key'     => 'related_area',
		'value'   => '456',
		'compare' => '=',
		'type'    => 'NUMERIC',
	),
);