NetSuite项目实现无效的行项目

我试图使用php netsuite api将salesorder设置为completed,但始终收到以下错误:

有效的行项目-您必须至少有一个有效的行项目 这次交易。

我用的是 https://github.com/ryanwinchester/netsuite-php 图书馆。

到目前为止,我有以下几点。我也试过使用初始化方法,我在一些例子中也看到过,但它们似乎都给出了相同的错误。如果有帮助的话,我们将使用先进的库存管理。

$itemFulfillment = new ItemFulfillment();

// Sales Order
$itemFulfillment->createdFrom = new RecordRef();
$itemFulfillment->createdFrom->internalId = <SALES_ORDER_ID>;

$itemFulfillment->shipStatus = ItemFulfillmentShipStatus::_shipped;

// Customer
$itemFulfillment->entity = new RecordRef();
$itemFulfillment->entity->internalId = <CUSTOMER_ID>;

// List
$fullfillmentList = new ItemFulfillmentItemList();
$fullfillmentList->replaceAll = true;

foreach($salesOrder->itemList->item as $saleItem) {
    $item = new ItemFulfillmentItem();
    $item->location = new RecordRef();
    $item->location->internalId = 4;
    $item->item = new RecordRef();
    $item->item->internalId = $saleItem->item->internalId;
    $item->itemIsFulfilled = true;
    $item->itemReceive = true;
    $item->quantity = $saleItem->quantity;
    $item->orderLine = $saleItem->line;           

    // Department Reference
    $departmentRec = new RecordRef();
    $departmentRec->internalId = 5;
    $item->department = $departmentRec;

    $fullfillmentList->item[] = $item;
}

$itemFulfillment->itemList = $fullfillmentList;


$request = new AddRequest();
$request->record = $itemFulfillment;

$client->add($request);

任何帮助都很好。:)