NetSuite SuiteScript 2.0

CheckDuplicateValue.js

function IsNewOrder(orderId) {
    var s = search.create({
        type: search.Type.SALES_ORDER,
        filters: [
            ['mainline', 'is', 'T'], 'and',
            ['trandate', 'onorafter', '04/01/2019'], 'and',
            ['otherrefnum', 'equalto', orderId]
        ],
        columns: ['otherrefnum']
    }).run().getRange({
        start: 0,
        end: 10
    });//should only be one
    if (s.length > 0) {
        var poNumber = s[0].getValue({
            name: 'otherrefnum'//unique value
        });
        if (poNumber == orderId) {
            return false;
        } else {
            return true;
        }
    } else {
        return true;
    }
}