Генерация сущностей для ORM Bitrix

<?
use
    Bitrix\Main\Loader,
    Bitrix\Main\Entity\ExpressionField,
    Bitrix\Forum\TopicTable,

    Bitrix\Main\Entity\Base;

require($_SERVER['DOCUMENT_ROOT'] . "/bitrix/modules/main/include/prolog_before.php");

Loader::includeModule('bizproc');
Loader::includeModule('forum');

$params = array(
    'filter' => array(
        '=ID' => 63,
        'XML_ID' => 'WF_%',
        '=FORUM_XML_ID' => 'bizproc_workflow',
        '!BP_WF.ID' => false
    ),
    'select' => array(
        'ID',
        'FORUM_XML_ID' => 'FORUM.XML_ID',
        new ExpressionField('BP_ID', 'REPLACE(%s, "WF_", "")', array('XML_ID'))
    ),
    'runtime' => array(
        'FORUM' => array(
            'data_type' => 'Bitrix\\Forum\\ForumTable',
            'reference' => array('=this.FORUM_ID' => 'ref.ID')
        ),
        'BP_WF' => array(
            'data_type' => 'Bitrix\\Bizproc\\WorkflowInstanceTable',
            'reference' => array('=this.BP_ID' => 'ref.ID')
        )
    ),
    'limit' => 1
);

$topicInfo = TopicTable::getList($params)->fetch();

echo "<pre>";print_r(TopicTable::query()->getLastQuery());echo "</pre>";
echo "<pre>";print_r($topicInfo);echo "</pre>";

$bpTaskEntityType = 'BpTaskTable';
$bpTaskTableName = array('table_name' => 'b_bp_task');
$bpTaskFields = getFieldMap4Table($bpTaskTableName['table_name']);
$eTaskTable = Base::compileEntity($bpTaskEntityType, $bpTaskFields, $bpTaskTableName);

$bpTaskUserEntityType = 'BpTaskUserTable';
$bpTaskUserTableName = array('table_name' => 'b_bp_task_user');
$bpTasksFields = getFieldMap4Table($bpTaskUserTableName['table_name']);
$eTaskUserTable = Base::compileEntity($bpTaskUserEntityType, $bpTasksFields, $bpTasksTableName);

$taskUser = $eTaskUserTable->getDataClass();
$params = array(
    'select' => array(
        'USER_ID'
    ),
    'filter' => array(
        '=BP_TASK.WORKFLOW_ID' => $topicInfo['BP_ID'],
        '=BP_TASK.ACTIVITY' => 'ApproveActivity',
        '!@USER_ID' => array('482')
    ),
    'runtime' => array(
        'BP_TASK' => array(
            'data_type' => $eTaskTable->getDataClass(),
            'reference' => array('=ref.ID' => 'this.TASK_ID')
        )
    )
);
$r = $taskUser::getList($params)->fetchAll();

echo "<pre>";print_r($taskUser::query()->getLastQuery());echo "</pre>";
echo "<pre>";print_r($r);echo "</pre>";

function getFieldMap4Table($tableName)
{
    global $DB;
    $fields = array();
    $q = "describe {$tableName};";
    $r = $DB->Query($q);
    while ($f = $r->Fetch())
    {
        $_f = array();

        if ($f['Key'] == 'Pri')
        {
            $_f['primary'] = true;
        }
        if ($f['Null'] == 'NO')
        {
            $_f['required'] = true;
        }


        $type = 'string';
        if (substr($f['Type'], 0, 4) === 'int(')
            $type = 'integer';
        elseif ($f['Type'] === 'datetime')
            $type = 'datetime';
        elseif ($f['Type'] === 'text')
            $type = 'text';

        $_f['data_type'] = $type;

        $fields[$f['Field']] = $_f;
    }
    return $fields;
}