nlapiCopyRecord not working on custom record

Hi,

I am trying to duplicate a record in a custom record type, but it seems to create a new record instead. First of all, I  when I ran my script it asked me to supply a 'name' (as the 'Include Name field' is checked) which I did, everything went through with no error. Then  I noticed that it had not duplicated the record, but instead just created a new one with all the fields empty. Can anyone please shed some light on this? Here is my code:

 var salesOrderAttr  = nlapiCopyRecord('customrecord_tran_item_att', 47);  salesOrderAttr.setFieldValue('custrecord_quote_id',null);  salesOrderAttr.setFieldValue('custrecord_sales_order_id',salesOrderId);  salesOrderAttr.setFieldValue('name', 'testing');  var errorFlag = nlapiSubmitRecord(salesOrderAttr);