AccountNumberGenerator::generateBySettings

static function generateBySettings(SaleOrderBase $order)
{
	$accountNumber = static::getNextNumber($order);
	if ($accountNumber)
	{
		$dbRes = $order::getList(['filter' => ["=ACCOUNT_NUMBER" => $accountNumber]]);
		if ($dbRes->fetch())
		{
			return null;
		}
	}

	return $accountNumber;
}