Element::update

public function update()
{
	$this->param->checkRequiredInputParams(
		[
			"IBLOCK_TYPE_ID",
			"IBLOCK_CODE",
			"IBLOCK_ID",
			"ELEMENT_CODE",
			"ELEMENT_ID",
		]
	);
	if ($this->param->hasErrors())
	{
		$this->errorCollection->add($this->param->getErrors());

		return false;
	}

	$this->validateFields();

	$isEnabledBp = $this->isEnabledBizproc($this->params["IBLOCK_TYPE_ID"]);
	$hasBpTemplatesWithAutoStart = false;
	if ($isEnabledBp)
	{
		$hasBpTemplatesWithAutoStart = $this->hasBpTemplatesWithAutoStart(CBPDocumentEventType::Edit);
	}

	if ($this->hasErrors())
	{
		return false;
	}

	list($elementSelect, $elementFields, $elementProperty) = $this->getElementData();

	$fields = $this->getElementFields($this->elementId, $this->params["FIELDS"]);

	$elementObject = new CIBlockElement;
	$updateResult = $elementObject->update($this->elementId, $fields, false, true, true);
	if ($updateResult)
	{
		if ($isEnabledBp && $hasBpTemplatesWithAutoStart)
		{
			$changedElementFields = CLists::checkChangedFields(
				$this->iblockId,
				$this->elementId,
				$elementSelect,
				$elementFields,
				$elementProperty
			);

			$this->startBp($this->elementId, CBPDocumentEventType::Edit, $changedElementFields);

			if ($this->hasErrors())
			{
				return false;
			}
		}

		return true;
	}
	else
	{
		if ($elementObject->LAST_ERROR)
		{
			$this->errorCollection->setError(
				new Error($elementObject->LAST_ERROR, self::ERROR_UPDATE_ELEMENT)
			);
		}
		else
		{
			$this->errorCollection->setError(
				new Error("Unknown error", self::ERROR_UPDATE_ELEMENT)
			);
		}

		return false;
	}
}