this is the entire script
/**
* @NApiVersion 2.x
* @NScriptType ClientScript
* @NModuleScope SameAccount
*/
define(['N/currentRecord', 'N/log', 'N/search'],
function(currentRecord, log, search) {
function fieldChanged(context) {
var record = context.currentRecord;
if (context.fieldId == 'quantity' || context.fieldId == 'item') {
var _rate = parseInt(record.getCurrentSublistValue("item", "rate"));
alert ('rate=' + _rate);
} //if (context.fieldId == 'item') {
}
return {
fieldChanged: fieldChanged
};
});