Task::saveDependencies

private function saveDependencies(array $fields)
{
	if (array_key_exists('DEPENDS_ON', $fields))
	{
		$dependence = new Dependence($this->userId, $this->taskId);
		$dependence->setPrevious($fields['DEPENDS_ON']);
	}

	$parentId = 0;
	if (array_key_exists('PARENT_ID', $fields))
	{
		$parentId = (int) $fields['PARENT_ID'];
	}

	// backward compatibility with PARENT_ID
	if ($parentId)
	{
		BitrixTasksInternalsHelperTaskDependence::attachNew($this->taskId, $parentId);
	}

	if (!$this->shiftResult)
	{
		return;
	}

	$shiftResult = $this->shiftResult;
	if ($parentId)
	{
		$childrenCountDbResult = CTasks::GetChildrenCount([], $parentId);
		$fetchedChildrenCount = $childrenCountDbResult->Fetch();
		$childrenCount = $fetchedChildrenCount['CNT'];

		if ($childrenCount == 1)
		{
			$scheduler = BitrixTasksProcessorTaskScheduler::getInstance($this->userId);
			$shiftResult = $scheduler->processEntity(
				0,
				$fields,
				array('MODE' => 'BEFORE_ATTACH')
			);
		}
	}

	$shiftResult->save(['!ID' => 0]);
}