The values ​​of the custom field of the section with the "List" type in 1C-Bitrix do not change. Why?

Question

1C-Bitrix

Good afternoon. I had a problem when working with the Bitrix API. I added a new custom field to the sections of the infoblock with the "List" type and added 3 values ​​to it with IDs 4,5,6, respectively. Since initially it will not be possible to select a value from the list for all sections that already exist, so I decided to select all sections of the infoblock and go through each of them, updating the user field UF_***. I read in the API that in order to change a property with the "List" type, you need to set the id of the field in this list to the array value. In my case, I want to mark a field in the list with id = 4. The result is something like this:

$arFilter = array(
  'IBLOCK_ID' => 4,
);

$arSelect = array(
  'ID',
  'CODE',
  'IBLOCK_ID',
  'NAME',
  'UF_CHOOSE_RULE'
);

$dbSection = CIBlockSection::GetList(array(), $arFilter, false, $arSelect);
while( $arSection = $dbSection-> GetNext() ){
   $sections[] = $arSection;
}

//print_r($sections);

$bs = new CIBlockSection;
foreach ($sections as $k => $sec) {
  $bs->Update($sec['ID'], array('UF_CHOOSE_RULE' => '6'));
}

I tried to execute this code, no errors are thrown, but there is no normal result either, as the "no" field was marked, it remained marked. What could be the matter? Or is it necessary to work with custom fields of sections differently?

Answer 1

Found a solution:

$bs->Update(ID_РАЗДЕЛА, array('UF_CHOOSE_RULE' => array( 
'VALUE' => 6
)))

Answer 2

Most likely, he just screwed up something with the names / values ​​\u200b\u200bout of carelessness.
Update just one element (attempt). Look at what the Update method returned. If false, then you look at the error in $bs->LAST_ERROR. Everything, the usual debug, it is necessary to create questions for the sake of this.