[FONT=inherit]Looking for someone to tell us more about the cause of "Invalid custom record type key" errors.

The code below is for updating an item review(StringCustomFieldRef).
We need some hints or suggestions about adding an item related review and updates to it?[/FONT]
  [INDENT][FONT=inherit]RecordRef recRef = new RecordRef();
recRef.setInternalId("265");//setting the internal id of the netsuite custom record

CustomRecord customRecord = new CustomRecord();
customRecord.setRecType(recRef);

StringCustomFieldRef customField = new StringCustomFieldRef();
customField.setValue("Reviews-ABC1-XA");//value to be assigned
customField.setInternalId("custitem_productreviews 1");//internal id of the field

CustomFieldList cf2 = new CustomFieldList(new CustomFieldRef[]{customField});
customRecord.setCustomFieldList(cf2);