Custom Field Update Failed

Hi,

I'm having trouble updating my custom field using Suitetalk.

Below is the part of my code:

$InvoiceId = $_GET['tranid'];

$InvoiceRecord = new nsComplexObject('Invoice');

$BooleanCustomField = new nsComplexObject('BooleanCustomFieldRef');
$BooleanCustomField->setFields(array('internalId' => 'custbody_pricecustom', 'value' => False));

$StringCustomField = new nsComplexObject('StringCustomFieldRef');
$StringCustomField->setFields(array('internalId' => 'custbody_tofollow', 'value' => 'Test'));

$InvoiceFields = array(
'internalId' => $InvoiceId,
'customFieldList' => array($BooleanCustomField));

$InvoiceRecord -> setFields($InvoiceFields);
$updateResponse = $myNSclient->update($InvoiceRecord);

when I try to update a boolean (Checkbox) field, it always fail to change. But when I update other custom field i.e. String Field, it works perfectly.