Hello. I use the API to create requests. To create a request using Powershell:

2. <Operation>
3. <Details>
4.                         <subject>" + $subject + "</subject>
5.                         <requester>Робот</requester>
6.                 <description>" + $description + "</description>
7.                         <site>Широтная (shi)</site>
8. <technician>Пятов Владимир Александрович</technician>
9. <level>Инцидент</level>
10. <category>КИС</category>
11. <subcategory>1С 7</subcategory>
12. <item>Ошибка репликации - РИБ</item>
13. <business>Дистрибуция</business>
14. <mode>Web форма</mode>
15. </Details>
16. </Operation>

The request is created, all the fields are put except technician. I tried different values of technician - the result is the same. 

Where the error be?

Thank you.