attributes.php

См. документацию.

<?php
 
namespace Bitrix\Sale\Rest;
 
class Attributes
{
    public const Undefined = '';
    public const Hidden = 'HID';
    public const ReadOnly = 'R-O';
    public const Immutable = 'IM'; //User can define field value only on create
    public const Required = 'REQ';
    public const Multiple = 'MUL';
    public const Dynamic = 'DYN';
    public const Computable = 'COM';
    public const Deprecated = 'DEP';
}