I can't get betwixt to write an attribute that is empty ("").

Here's de .betwixt file:

------------------
<info primitiveTypes="attributes">
    <element name="sso">
        <element name="id">
            <attribute name="src" property="idOrigen" />
            <attribute name="dst" value="cn=AuthServer, ou=DESEIN,
o=AFIP, c=AR" />
            <attribute name="unique_id" property="idMensaje" />
            <attribute name="gen_time" property="fechaGeneracion" />
            <attribute name="exp_time" property="fechaExpiracion" />
        </element>
        <element name="operation">
            <attribute name="type" value="login" />
            <element name="login">
                <attribute name="entity" property="cuitOrigen" />
                <attribute name="system" value="" />
                <attribute name="username" property="cuitUsuario" />
                <attribute name="authmethod" value="passphrase" />
                <element name="profile">
                    <element name="cuit">
                        <attribute name="number" property="cuitUsuario"
/>
                    </element>
                </element>
            </element>
        </element>
    </element>    
</info>
------------------

This is the class:

------------------
public class InterconexionSETI
{
	private String idOrigen;
	private String cuitOrigen;
	private String idMensaje;
	private String fechaGeneracion;
	private String fechaExpiracion;
	private String cuitUsuario;
	
      [...]
}
------------------

This is the mapping rutine:

------------------
StringWriter resultWriter = new StringWriter();
BeanWriter writer = new BeanWriter(resultWriter);
writer.getBindingConfiguration().setMapIDs(false);
//writer.getBindingConfiguration().setValueSuppressionStrategy(ValueSupp
ressionStrategy.ALLOW_ALL_VALUES);
writer.enablePrettyPrint();

try {
	writer.write(setiBean);
}
catch (IOException ioex) { }
catch (SAXException saxex) { }
catch (IntrospectionException iex) { }
				
return resultWriter.toString();
------------------

I get the following xml:

------------------
  <sso>
    <id src="CN=DEMO,OU=Seguridad Informatica,O=Certificacion
2,L=Capital Federal,ST=Buenos Aires,C=AR" dst="cn=AuthServer, ou=DESEIN,
o=AFIP, c=AR" unique_id="9991" gen_time="1163789407"
exp_time="1163790007"/>
    <operation type="login">
      <login entity="30604796357" username="27281677050"
authmethod="passphrase">
        <profile>
          <cuit number="27281677050"/>
        </profile>
      </login>
    </operation>
  </sso>
------------------

Where the <login> element doesn't include the "system" attribute.

I've tried using the ValueSuppressionStrategy.ALLOW_ALL_VALUES, but I
get the following xml:

------------------
  <sso>
    <id/>
    <operation>
      <login>
        <profile>
          <cuit/>
        </profile>
      </login>
    </operation>
  </sso>
------------------

What am I doing wrong??

---
Juan Eduardo Vicente

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