Problem while adding a sales order item list

Hi,

I am trying to add a sales order item list. In this list there is a field called options. when I click options in the GUI I get to a page where I have some fields like TID, TNS... etc., all are text fields. Out of which TID is a compulsory field.

Here is my code to add TID:
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  //Add item options (TID - mandatory)
  CustomFieldList customFieldList1 = new CustomFieldList();
  CustomFieldRef[] customFieldRef1 = new CustomFieldRef[1];
  StringCustomFieldRef[] stringCustomFieldRef1 = new StringCustomFieldRef[1];
  stringCustomFieldRef1[0] = new StringCustomFieldRef();
  stringCustomFieldRef1[0].setInternalId("custcol_tid");
  stringCustomFieldRef1[0].setValue("1234");
  customFieldRef1[0] = stringCustomFieldRef1[0];
  customFieldList1.setCustomField(customFieldRef1);
  salesOrderItem[0].setOptions(customFieldList1);
 
  salesOrderItemList.setItem(salesOrderItem);
  salesOrder.setItemList(salesOrderItemList);