ElementV2Table::onAfterAdd

static function onAfterAdd(Event $event)
{
	parent::onAfterAdd($event);

	$id = $event->getParameter('id');
	$table = static::getEntity()->getSingleValueTableName();
	$connection = static::getEntity()->getConnection();

	// create single value row
	$connection->add($table, ['IBLOCK_ELEMENT_ID' => $id]);
}