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$this->WriteToTrackingService('$arState: ' . print_r($arState,true));

$root = $this->GetRootActivity();

$filter = Array ("ACTIVE"  => "Y");
$rsUsers = CUser::GetList(($by="active"), ($order="desc"), $filter, $arParams["SELECT"] = array("UF_DEPARTMENT"));


while($arUser = $rsUsers->Fetch()){

    $uIDs[] = 'user_' . $arUser['ID'];

}

$root->SetVariable("UserMultiple", $uIDs);

$entityId = "TASKS_TASK";
$arFilter = array("ENTITY_ID" => $entityId , 'USER_TYPE_ID' => 'enumeration');

$rs = CUserTypeEntity::GetList(array(), $arFilter);
while($arUserField = $rs->Fetch()){
    $arRes[] = $arUserField;
}

Array
(
    [0] => Array
        (
            [ID] => 429
            [ENTITY_ID] => TASKS_TASK
            [FIELD_NAME] => UF_TEST
            [USER_TYPE_ID] => enumeration
            [XML_ID] => 
            [SORT] => 100
            [MULTIPLE] => N
            [MANDATORY] => N
            [SHOW_FILTER] => N
            [SHOW_IN_LIST] => Y
            [EDIT_IN_LIST] => Y
            [IS_SEARCHABLE] => N
            [SETTINGS] => Array
                (
                    [DISPLAY] => LIST
                    [LIST_HEIGHT] => 1
                    [CAPTION_NO_VALUE] => 
                    [SHOW_NO_VALUE] => Y
                )

        )

)

use \CCrmOwnerType,
    \Bitrix\Crm\ItemIdentifier,
    \Bitrix\Crm\Activity\Entity\ToDo
   ;
# Получение дела по его ID
/**
 * Suggested 'todo' activity id
 * @var integer
 */
$activityId = 123;

/**
 * @var null|ToDo
 */

$todoEntity = ToDo::load($entityItemIdentifier, $activityId);

$entityItemIdentifier = new ItemIdentifier(CCrmOwnerType::Deal, 16);

        /*-- Добавляем данные в мультиполя - теелфон, мэйл компании*/
        \Bitrix\Main\Loader::includeModule('crm');
                $ds = new \CCrmFieldMulti;
                $ds->Add(
                    array(
                        'ENTITY_ID'  => $ENTITY_ID, // ИД- компании
                        'ELEMENT_ID' => $ELEMENT_ID,
                        'VALUE'      =>  $VALUE, 
                        'TYPE_ID'    =>  $TYPE_ID, 
                        'VALUE_TYPE' =>  $VALUE_TYPE, 
                        'COMPLEX_ID' =>  $COMPLEX_ID
                    )
                );
        /* --/Добавляем данные*/

        /*-- обновляем данныев мультиполя - теелфон, мэйл компании*/
        \Bitrix\Main\Loader::includeModule('crm');
                $ds = new \CCrmFieldMulti;
                $ds->Update(
                    $mfID,   // ИД- мультиполя
                    array(
                        'VALUE'      =>  $VALUE, 
                        'TYPE_ID'    =>  $TYPE_ID, 
                        'VALUE_TYPE' =>  $VALUE_TYPE, 
                        'COMPLEX_ID' =>  $COMPLEX_ID
                    )
                );

        /* --/Обновляем данные*/