Update an existing line on record transform

Hi There

I have the following script:

/**

 *@NApiVersion 2.x

 *@NScriptType MapReduceScript

 */

define(["N/record", "N/search", "N/runtime"], function (

  record,

  search,

  runtime

) {

  function getInputData() {

    try {

      var scriptObj = runtime.getCurrentScript();

      var recordId = scriptObj.getParameter("custscript_recordid");

      var salesOrderid = recordId;

      log.debug("recordid", salesOrderid);

      var salesorderSearchObj = search.create({

        type: "salesorder",

        filters: [

          ["type", "anyof", "SalesOrd"],

          "AND",

          ["internalid", "anyof", [salesOrderid]],

          "AND",

          ["shipping", "is", "F"],

          "AND",

          ["taxline", "is", "F"],

          "AND",

          ["mainline", "is", "F"],

          "AND",

          [

            "formulanumeric: {quantitypacked}-{quantitybilled}",

            "greaterthan",

            "0",

          ],

        ],

        columns: [

          search.createColumn({ name: "internalid", label: "Internal ID" }),

          search.createColumn({ name: "source", label: "Source" }),

          search.createColumn({ name: "salesrep", label: "Sales Rep" }),

          search.createColumn({ name: "trandate", label: "Date" }),