Simple Transformation - XML to Internal Table Error

I have a webservice call that returns XML. I need to transform a portion of the response to an internal table, but my simple transformation is not working with loop processing. I have read through most posts regarding the topic but they're either too old or related to serialization. There aren't any exceptions thrown, but I don't get any data in the internal table (PAPERWORK root). Below are some code snippets. Any ideas on the problem with the XSLT template? Thanks.

Sample XML:

 
<?xml version="1.0" encoding="utf-8" ?>
<PrintVersionDataSet>
<Result>
<ReturnCode>W</ReturnCode> 
<ReturnMessage>There are reports with later version(s)</ReturnMessage> 
</Result>
<Paperwork>
<ReportCode>CVR</ReportCode> 
<ReportName>Cover Sheet</ReportName> 
<Version>2</Version> 
<PrintedDateTime>2009-05-01T09:54:04.1-05:00</PrintedDateTime> 
</Paperwork>
<Paperwork>
<ReportCode>SPS</ReportCode> 
<ReportName>Sponsor Summary</ReportName> 
<Version>2</Version> 
<PrintedDateTime>2009-05-01T09:54:04.99-05:00</PrintedDateTime> 
</Paperwork>
</PrintVersionDataSet>

XSLT Code:

<?sap.transform simple?>
<tt:transform xmlns:tt="http://www.sap.com/transformation-templates">

  <tt:root name="RESULT"/>
  <tt:root name="PAPERWORK"/>

  <tt:template>

    <PrintVersionDataSet>

      <Result tt:ref="RESULT">

        <ReturnCode>
          <tt:value ref="RETURNCODE"/>
        </ReturnCode>

        <ReturnMessage>
          <tt:value ref="RETURNMESSAGE"/>
        </ReturnMessage>

      </Result>

      <tt:deserialize>

        <tt:loop ref=".PAPERWORK">

          <Paperwork>
            <ReportCode>
              <tt:value ref="REPORTCODE"/>
            </ReportCode>

            <ReportName>
              <tt:value ref="REPORTNAME"/>
            </ReportName>

            <Version>
              <tt:value ref="VERSION"/>
            </Version>

            <PrintedDateTime>
              <tt:value ref="PRINTEDDATETIME"/>
            </PrintedDateTime>

          </Paperwork>

        </tt:loop>

      </tt:deserialize>

    </PrintVersionDataSet>

  </tt:template>

</tt:transform> 

ABAP Call to Transform Data:

TRY.
      
CALL TRANSFORMATION Z_GA_PAPERWORK_VERS_WEBSVC
      SOURCE XML LS_RESPONSE-VERIFY_PRINT_VERSION_RESULT
      RESULT RESULT     = LS_RESULT
             PAPERWORK  = LT_PAPERWORK.

    CATCH CX_ROOT INTO ROOT_EXCEPTION.

      CALL METHOD ROOT_EXCEPTION->IF_MESSAGE~GET_TEXT
        RECEIVING
          RESULT = LV_MESSAGE.

  ENDTRY.