In Netsuite, the Standard Country list's internal id cannot be seen through UI. We need to find the internal id of the country we are about to set to the field

Solution

Get the country value from any of the Netsuite records and store it in a variable

For ex: Pulling ship country from sales order and setting that value to a country list/record custom field of a custom record.

Added a code snippet below

var shipCountry=salesorder.getValue('shipcountry) //or retreive from the address book

var stateSearchObj = _search.create({

type: "state",

filters:

[

["country","anyof",shipCountry]

],

columns:

[

_search.createColumn({name: "country", label: "Country"})