Xstream - Deserializando XML

Pessoal, estou recebendo erro ao tentar deserializar o XML abaixo utilizando XStream 1.22.
Na estrutura abaixo existem N "LINHA" dentro de FPATIVO. Parece dar erro assim que carrega a segunda linha, porém tenho um List para receber estas linhas. Alguma idéia?

DFPATIVO.xml

<DFPATIVO.DB>
  <LINHA CODCVM="018821" DATADFP="31/12/2006" TIPO_DOC="2" CODCONTA="1" DESCONTA="Ativo Total" VALOR3="1768285" VALOR2="1593258" VALOR1="1217927" OBRIGATORI="True" TIPO_INF="C" /> 
  <LINHA CODCVM="018821" DATADFP="31/12/2006" TIPO_DOC="2" CODCONTA="1.01" DESCONTA="Ativo Circulante" VALOR3="497383" VALOR2="229043" VALOR1="455321" OBRIGATORI="True" TIPO_INF="C" /> 
   ...
</DFPATIVO.DB>

Dfpativo:

import java.util.ArrayList;
import java.util.List;

import com.thoughtworks.xstream.annotations.XStreamAlias;

@XStreamAlias("DFPATIVO.DB")
public class DfpAtivo 
{
	
	@XStreamAlias("LINHA")
	List<Linha> linha = new ArrayList<Linha>();
//getters e setters

}

Linha:

import com.thoughtworks.xstream.annotations.XStreamAlias;

@XStreamAlias("LINHA")
public class Linha 
{

	@XStreamAlias("CODCVM")
	private String codcvm;
	
	@XStreamAlias("DATADFP")
	private String dataDfp;

	@XStreamAlias("TIPO_DOC")
	private String tipodoc;

	@XStreamAlias("CODCONTA")
	private String codconta;
	
	@XStreamAlias("DESCCONTA")
	private String descconta;
	
	@XStreamAlias("VALOR3")
	private String valor3;

	@XStreamAlias("VALOR2")
	private String valor2;
	
	@XStreamAlias("VALOR1")
	private String valor1;

	@XStreamAlias("OBRIGATORI")
	private String obrigatori;
	
	@XStreamAlias("TIPO_INF")
	private String tipo_inf;
//getters e setters
}

Chamada:

XStream xstream = new XStream();
			Annotations.configureAliases(xstream, DfpAtivo.class,Linha.class);
			DfpAtivo dfp = (DfpAtivo) xstream.fromXML(xml);

Recebo o seguinte erro:

Exception in thread "main" com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$DuplicateFieldException: linha
---- Debugging information ----
duplicate-field     : linha
class               : DfpAtivo
required-type       : DfpAtivo
path                : /DFPATIVO.DB/LINHA[2]
line number         : 4
-------------------------------
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$SeenFields.add(AbstractReflectionConverter.java:271)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:204)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:125)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:56)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:45)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:46)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:117)
	at com.thoughtworks.xstream.core.ReferenceByXPathMarshallingStrategy.unmarshal(ReferenceByXPathMarshallingStrategy.java:29)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:846)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:833)
	at com.thoughtworks.xstream.XStream.fromXML(XStream.java:789)
	at Teste.main(Teste.java:18)

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