CCrmOwnerType::loadResponsibleId

static function loadResponsibleId(int $entityTypeId, int $entityId, bool $checkRights = true): int
{
	$result = 0;

	switch($entityTypeId)
	{
		case self::Lead:
		{
			$dbRes = CCrmLead::GetListEx(array(), array('=ID' => $entityId, 'CHECK_PERMISSIONS' => ($checkRights ? 'Y' : 'N')), false, false, array('ASSIGNED_BY_ID'));
			$arRes = $dbRes ? $dbRes->Fetch() : null;
			$result = $arRes ? intval($arRes['ASSIGNED_BY_ID']) : 0;
			break;
		}
		case self::Contact:
		{
			$dbRes = CCrmContact::GetListEx(array(), array('=ID' => $entityId, 'CHECK_PERMISSIONS' => ($checkRights ? 'Y' : 'N')), false, false, array('ASSIGNED_BY_ID'));
			$arRes = $dbRes ? $dbRes->Fetch() : null;
			$result = $arRes ? intval($arRes['ASSIGNED_BY_ID']) : 0;
			break;
		}
		case self::Company:
		{
			$dbRes = CCrmCompany::GetListEx(array(), array('=ID' => $entityId, 'CHECK_PERMISSIONS' => ($checkRights ? 'Y' : 'N')), false, false, array('ASSIGNED_BY_ID'));
			$arRes = $dbRes ? $dbRes->Fetch() : null;
			$result = $arRes ? intval($arRes['ASSIGNED_BY_ID']) : 0;
			break;
		}
		case self::Deal:
		{
			$dbRes = CCrmDeal::GetListEx(array(), array('=ID' => $entityId, 'CHECK_PERMISSIONS' => ($checkRights ? 'Y' : 'N')), false, false, array('ASSIGNED_BY_ID'));
			$arRes = $dbRes ? $dbRes->Fetch() : null;
			$result = $arRes ? intval($arRes['ASSIGNED_BY_ID']) : 0;
			break;
		}
		case self::Invoice:
		{
			$dbRes = CCrmInvoice::GetList(array(), array('ID' => $entityId), false, false, array('RESPONSIBLE_ID'));
			$arRes = $dbRes ? $dbRes->Fetch() : null;
			$result = $arRes ? intval($arRes['RESPONSIBLE_ID']) : 0;
			break;
		}
		case self::Activity:
		{
			$dbRes = CCrmActivity::GetList(array(), array('=ID' => $entityId, 'CHECK_PERMISSIONS' => ($checkRights ? 'Y' : 'N')), false, false, array('RESPONSIBLE_ID'));
			$arRes = $dbRes ? $dbRes->Fetch() : null;
			$result = $arRes ? intval($arRes['RESPONSIBLE_ID']) : 0;
			break;
		}
		case self::Quote:
		{
			$dbRes = CCrmQuote::GetList(array(), array('=ID' => $entityId, 'CHECK_PERMISSIONS' => ($checkRights ? 'Y' : 'N')), false, false, array('ASSIGNED_BY_ID'));
			$arRes = $dbRes ? $dbRes->Fetch() : null;
			$result = $arRes ? intval($arRes['ASSIGNED_BY_ID']) : 0;
			break;
		}
		case self::Order:
		{
			if($checkRights && !\Bitrix\Crm\Order\Permissions\Order::checkReadPermission($entityId))
			{
				break;
			}

			$dbRes = Bitrix\Crm\Order\Order::getList(array('filter' => array('=ID' => $entityId), 'select' => array('RESPONSIBLE_ID')));
			$arRes = $dbRes ? $dbRes->fetch() : null;
			$result = $arRes ? intval($arRes['RESPONSIBLE_ID']) : 0;
			break;
		}
	}

	if ($result === 0 && static::isUseDynamicTypeBasedApproach($entityTypeId))
	{
		$factory = Container::getInstance()->getFactory($entityTypeId);
		if ($factory)
		{
			$parameters = [
				'select' => [
					\Bitrix\Crm\Item::FIELD_NAME_ASSIGNED,
				],
				'filter' => [
					'=ID' => $entityId,
				],
				'limit' => 1,
			];
			if ($checkRights)
			{
				$items = $factory->getItemsFilteredByPermissions($parameters);
			}
			else
			{
				$items = $factory->getItems($parameters);
			}
			if (count($items) > 0 && $items[0] && $items[0] instanceof \Bitrix\Crm\Item)
			{
				$result = (int)$items[0]->getAssignedById();
			}
		}
	}

	return $result;
}