Custom fields in traceability report

Hi,

For the current project our QA doesn't want us to use RQ numbers for traceability but rather QA-governed requirements numbers. These are in form of PRJ-SW-XXXX, where the XXXX is manually assigned requirements number for the subproject.

To accomodate this, I've created a mandatory custom field for requirements, which shall contain these QA numbers. 

It is fairly easy to include QA numbers for the requirements inside of the current projects but I can't figure out how to do the same for linked requirements?

Here's what I want to achieve:

To do it, I created a the following template. It works for QA ID column but not for "Traced to QA ID" one. What am I doing wrong?

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">
  <xsl:template match="/RequirementData">
    <table class="DataGrid" style="width:100%">
      <tr>
        <th>MDX ID</th>
        <th>Brief</th>
        <th>Type</th>
        <th>Status</th>
        <th>Release #</th>
        <th>Test Traceability</th>
        <th>Traced to MDX ID</th>
      </tr>
      <xsl:for-each select="Requirement">
        <tr>
          <td>
            <xsl:if test="IsSummary='True'">
            </xsl:if>
            <xsl:if test="IsSummary='False'">
              <xsl:value-of select='CustomProperties/CustomProperty[Name="Custom_01"]/Value'/>
            </xsl:if>
            
          </td>
          <td>
            <xsl:attribute name="style">
              padding-left: <xsl:value-of select="string-length(IndentLevel)*2"/>px;
            </xsl:attribute>
            <xsl:if test="IsSummary='True'">
              <b>
                <xsl:value-of select="Name"/>
              </b>
            </xsl:if>
            <xsl:if test="IsSummary='False'">
              <xsl:value-of select="Name"/>
            </xsl:if>
          </td>
          <td>
            <xsl:if test="IsSummary='True'">
            </xsl:if>
            <xsl:if test="IsSummary='False'">
            <xsl:value-of select="RequirementTypeName"/>
            </xsl:if>
          </td>
          <td>
            <xsl:if test="IsSummary='True'">
            </xsl:if>
            <xsl:if test="IsSummary='False'">
            <xsl:value-of select="RequirementStatusName"/>
            </xsl:if>
          </td>
          <td>
            <xsl:if test="IsSummary='True'">
            </xsl:if>
            <xsl:if test="IsSummary='False'">
            <xsl:value-of select="ReleaseVersionNumber"/>
            </xsl:if>
          </td>
          <td>
            <xsl:if test="IsSummary='True'">
            </xsl:if>
            <xsl:if test="IsSummary='False'">
               <xsl:for-each select="TestCases/TestCase">
                 <xsl:if test="position() > 1">
                   , TC<xsl:value-of select="TestCaseId"/>
                 </xsl:if>
                 <xsl:if test="position() = 1">
                   TC<xsl:value-of select="TestCaseId"/>
                 </xsl:if>
               </xsl:for-each>
            </xsl:if>
          </td>
          <td>
            <xsl:if test="IsSummary='True'">
            </xsl:if>
            <xsl:if test="IsSummary='False'">
               <xsl:for-each select="Requirements/ArtifactLink">
                  <xsl:if test="position() > 1">
                    <xsl:value-of select="ArtifactName"/>,<br />
                    <xsl:value-of select="ArtifactLinkTypeName"/>
                  </xsl:if>
                  <xsl:if test="position() = 1">
                    <xsl:value-of select="ArtifactLinkTypeName"/><br />
                    [PR:<xsl:value-of select="ProjectId"/>] :
                    <xsl:value-of select='Properties/CustomProperty[Name="Custom_01"]/Value'/>
                  </xsl:if>
               </xsl:for-each>
           </xsl:if>
          </td>
        </tr>
      </xsl:for-each>
    </table>
  </xsl:template>
</xsl:stylesheet>