bp_get_the_notification_secondary_item_id()

	function bp_get_the_notification_secondary_item_id() {

		/**
		 * Filters the secondary associated item ID of the notification currently being iterated on.
		 *
		 * @since BuddyPress 1.9.0
		 *
		 * @param int $secondary_item_id ID of the secondary associated item.
		 */
		return apply_filters( 'bp_get_the_notification_secondary_item_id', buddypress()->notifications->query_loop->notification->secondary_item_id );
	}