ElementUserFieldProvider.php

<?php
 
namespace Bitrix\Iblock\Integration\UI\EntitySelector;
 
use Bitrix\Iblock\UserField\Types\ElementType;
 
class ElementUserFieldProvider extends BaseUserFieldProvider
{
    protected function getEntityId(): string
    {
        return 'iblock-element-user-field';
    }
 
    protected function getEnumTypeClass(): string
    {
        return ElementType::class;
    }
}