SSP Update List/Record, Custom List

We attach a custom transaction body field to the SO. The custom body field is of type "List/Record" and utilizes a custom list (A list of countries intended for product export). I grab the internalid using a saved search, but NetSuite does not save the value when running LiveOrder: update().
Stock code below:

        // Transaction Body Field          if (is_secure && !_.isEmpty(data.options))          {              order.setCustomFieldValues(data.options);          }

The above code correctly updates values to free-form text fields and checkbox fields, but does not update the value for custom List/Record.

Could you please help me to update this custom field of type List/Record: custom list?