从Netsuite的子列表中获取价值

Question

我试图从Netsuite中的记录中的子列表中获取值，但我似乎无法获得值，我只能得到null。这就是我正在做的事情：

首先我用nlapiLoadRecord

获取记录

fulfillment = nlapiLoadRecord('itemFulfillment', '102568');

我得到子列表的itemCount：

var itemCount = fulfillment.getLineItemCount('item');

我创建一个循环来获取值，但是这里返回所有空值：

for(var y = 1; y <= itemCount; y++){
    info += fulfillment.getLineItemValue('items', 'custcol_old_material_num', i) + " ";
}

我得到的fullfillment对象是下一个：

fulfillment:{
  "finalshipto": "text",
  "shipstatus": {
    "internalid": "C",
    "name": "Shipped"
  },
  ......
  ......
  ......
  "item": [  <--this is what I want to access
    {
      "custcol_calculated_weight": 835.2,
      "custcol_item_weight ": 17.4,
      "custcol_old_material_num": "56624210655084",
      "description": "1x1x-xxxx TEXT", <---this is the data I want to print
      "excludefromraterequest": false,
      "inventorydetail": {
        "itemdescription": "1x1x-xxxx TEXT",
        "item": {
          "internalid": "xxxx",
          "name": "xxxxxxx"
        },
        "unit": {
          "internalid": "1",
          "name": "TEXT"
        },
        "quantity": xx,
        "inventoryassignment": [
          {
            "binnumber": {
              "internalid": "xxxx",
              "name": "TEXT"
            },
            "quantity": 48,
            "quantityavailable": 48
          }
        ]