CListPropertyField::Update

public function Update($arFields)
{
	if(isset($arFields["TYPE"]))
		$newType = $arFields["TYPE"];
	else
		$newType = $this->GetTypeID();

	if(is_array($this->_property) && !CListFieldTypeList::IsField($newType))
	{
		if (self::existPropertyCode($this->_iblock_id, $arFields["CODE"], $this->_property["ID"]))
		{
			throw new NotSupportedException(GetMessage("LIST_PROPERTY_FIELD_DUPLICATE_CODE"));
		}

		foreach($this->GetArray() as $id => $val)
			if(array_key_exists($id, $arFields) && $id != "IBLOCK_ID")
				$this->_property[$id] = $arFields[$id];

		if(mb_strpos($newType, ":") !== false)
			list($this->_property["PROPERTY_TYPE"], $this->_property["USER_TYPE"]) = explode(":", $newType);
		else
		{
			$this->_property["PROPERTY_TYPE"] = $newType;
			$this->_property["USER_TYPE"] = "";
		}

		$this->_property["CHECK_PERMISSIONS"] = "N";
		$this->_property["ACTIVE"] = "Y";

		$obProperty = new CIBlockProperty;
		if($obProperty->Update($this->_property["ID"], $this->_property))
		{
			self::resetPropertyArrayCache();

			if($this->_property["PROPERTY_TYPE"] == "L" && is_array($arFields["LIST"] ?? null))
				CList::UpdatePropertyList($this->_property["ID"], $arFields["LIST"]);

			return new CListPropertyField($this->_property["IBLOCK_ID"], "PROPERTY_".$this->_property["ID"], $arFields["NAME"], $arFields["SORT"]);
		}
		elseif (!empty($obProperty->LAST_ERROR))
		{
			throw new ArgumentException($obProperty->LAST_ERROR);
		}
	}

	return null;
}