Vat::addAction

public function addAction(array $fields): ?array
{
	$application = self::getApplication();
	$application->ResetException();

	$addResult = CCatalogVat::Add($fields);
	if (!$addResult)
	{
		if ($application->GetException())
		{
			$this->addError(new Error($application->GetException()->GetString()));
		}
		else
		{
			$this->addError(new Error('Error adding VAT'));
		}

		return null;
	}

	return ['VAT' => $this->get($addResult)];
}