Enum attribute combined with text content output incorrect

See the following code snippet

Enum Symbology {RIC, ISIN};

@XStreamAlias("view")
@XStreamConverter(value = ToAttributedValueConverter.class, strings ={"Underlying"})
public class UnderlyingView {
  @XStreamAsAttribute public Symbology symbology;
  public String Underlying;
}

Whenever this class is converted to XML (irrespective of driver) the output is as follows <view>RICunderlying1</view>(with below simple groovy snippet):

XStream xStream = new XStream()
UnderlyingView un = new UnderlyingView([symbology: "RIC", Underlying: "underlying1"])
println xStream.toXML(un)

The text content is all fine, however the attribute, which is an enum is lost, and merged into the text node. It is also possible to deserialize a properly formatted XML {{<view symbology="RIC">Underlying1</view>}}into this view.

From looking at the code for ToAttributedValueConverter it only works properly if the converter in use is a SingleValueConverter. However XStream is using EnumConverter for the enum, and not EnumSingleValueConverter.