Netsuite：PHP Toolkit检索附加到销售订单的Item Fulfillment记录

Question

正如主题所说，我希望能够使用PHP工具包检索附加到销售订单记录的Item Fulfillment记录（如果有）。

以下代码将根据自定义字段的值检索销售订单和现金销售记录，但我无法将其包含在物料履行记录中。任何帮助将不胜感激。

$ts = new TransactionSearch();
$tsb = new TransactionSearchBasic();
$csf = new SearchStringCustomField();
$csf->internalId = '69';
$csf->searchValue = '100000137';
$csf->operator = 'is';
$scfl = new SearchCustomFieldList();
$scfl->customField = array($csf);
$tsb->customFieldList = $scfl;
$ts->basic = $tsb;
$request = new SearchRequest();
$request->searchRecord = $ts;
$searchResponse = $service->search($request);