Letter::copy

public function copy()
{
	$configurationId = $this->getMessage()->getConfiguration()->getId();
	if (!$configurationId)
	{
		return null;
	}

	$result = $this->getMessage()->copyConfiguration($configurationId);
	if (!$result->isSuccess() || !$result->getId())
	{
		return null;
	}

	$data = array(
		'CAMPAIGN_ID' => $this->get('CAMPAIGN_ID'),
		'MESSAGE_CODE' => $this->get('MESSAGE_CODE'),
		'MESSAGE_ID' => $result->getId(),
		'REITERATE' => $this->get('REITERATE'),
		'TEMPLATE_TYPE' => $this->get('TEMPLATE_TYPE'),
		'TEMPLATE_ID' => $this->get('TEMPLATE_ID'),
		'CREATED_BY' => $this->getUser()->getId(),
		'UPDATED_BY' => $this->getUser()->getId(),
		'IS_TRIGGER' => $this->get('IS_TRIGGER'),
		'TITLE' => Loc::getMessage('SENDER_ENTITY_LETTER_COPY_PREFIX') . ' ' . $this->get('TITLE'),
		'SEGMENTS_INCLUDE' => $this->get('SEGMENTS_INCLUDE'),
		'SEGMENTS_EXCLUDE' => $this->get('SEGMENTS_EXCLUDE'),
	);
	$instance = static::create()->mergeData($data);
	$instance->save();
	$this->getErrorCollection()->add($instance->getErrors());

	if (!is_null($this->getMessage()->getConfiguration()->get('MESSAGE')))
	{
		FileTable::syncFiles(
			$instance->getId(),
			0,
			$this->getMessage()->getConfiguration()->get('MESSAGE')
		);
	}

	return $instance->getId();
}