var record=nlapiLoadRecord('customer', 1397,{recordmode: 'dynamic'});
var lines=record.getLineItemCount('contactroles');
record.selectNewLineItem('contactroles');
record.setCurrentLineItemValue('contactroles', 'contact', 'rahman');
record.setCurrentLineItemValue('contactroles', 'email', '
r@cloud.com');
record.commitLineItem('contactroles');
nlapiSubmitRecord(record, false, true);