Is it possible for a script to reference a line on a new record?

Question

This relates to some older questions on SuiteScript 1.0. I've got a 2.0 script that has to be 2.0, so I can't use the old nlapiGetLineItemValue - it has to be Record.getSublistValue(options). But I need it to get the line value on a new, unsaved record BeforeSubmit.

It keeps returning "getSublistValue" is not defined in object, and checking NetSuite Field Explorer confirms that the unsaved record has no defined lines. The same applies to AfterSubmit.

So is there any work around, or is it even possible, to reference the line item value when the record is being created?

ADDING SOME CODE, WHERE THE QUESTION APPLIES:

var recNew = context.newRecord
var ItemID = recNew.getSublistValue({
    sublistId: 'items',
    fieldId: 'itemid',
});
var listIDs = ["6646", "17745", "17945", "21349"];

var a_filters = [];
a_filters.push(new nlobjSearchFilter(ItemID, null, 'anyof', listIDs));
{
   // an action
   }

Answer 1

getSublistValue requires you to pass the line number.

var recNew = context.newRecord 
for (var x =0; x< recNew.getLineCount({sublistId:'item'}); x++) {
     var ItemID = recNew.getSublistValue({ sublistId: 'item', fieldId: 'item', line: x });
     // DO STUFF
}