Processing XML file with Parent child layout

I have the following XML to process into PeopleSoft using Application Engine and File Layout, I am not able to make the delivered PeopleCode to work when you drag the File Layout to PeopleCode window, a file example is below

<INVOICE>

 <INVOICEHEADER>

  <INVOICEID>139774</INVOICEID>

  <COMPANYCODE>INTEGRIM</COMPANYCODE>

  <APPROVERS>

   <APPROVER>

    <APPROVERID>140329</APPROVERID>

   </APPROVER>

    <APPROVER>

    <APPROVERID>140330</APPROVERID>

   </APPROVER>

  </APPROVERS>

 </INVOICEHEADER>

 <BOOKLINES>

  <BOOKLINE>

   <BOOKLINEID>140064</BOOKLINEID>

   <GENERALLEDGERCODE>10143</GENERALLEDGERCODE>

  </BOOKLINE>

   <BOOKLINE>

   <BOOKLINEID>140065</BOOKLINEID>

   <GENERALLEDGERCODE>10144</GENERALLEDGERCODE>

  </BOOKLINE>

 </BOOKLINES>

</INVOICE>