CAllCrmLead::GetLeftSiblingID

static function GetLeftSiblingID($ID)
{
	$ID = intval($ID);
	if($ID <= 0)
	{
		return 0;
	}

	$dbRes = self::GetListEx(
		array('ID' => 'DESC'),
		array(' $ID, 'CHECK_PERMISSIONS' => 'N'),
		false,
		array('nTopCount' => 1),
		array('ID')
	);

	$arRes =  $dbRes->Fetch();
	if(!is_array($arRes))
	{
		return 0;
	}

	return intval($arRes['ID']);
}