CBPDocumentService::addDocumentField

public function addDocumentField($parameterDocumentType, $arFields)
{
	[$moduleId, $entity, $documentType] = CBPHelper::ParseDocumentId($parameterDocumentType);

	if ($moduleId)
	{
		CModule::IncludeModule($moduleId);
	}

	if (class_exists($entity))
	{
		$result = call_user_func_array([$entity, 'AddDocumentField'], [$documentType, $arFields]);
		if ($result)
		{
			$k = $moduleId."@".$entity."@".$documentType;
			unset($this->documentFieldsCache[$k]);
		}

		return $result;
	}

	return false;
}