How to print the value of attribute /Period/@dateFrom where attibute(@groupType='B')

<xsl:variable name="VariantA">
    <AccessFeesGroupList>
            <xsl:call-template name="createAccessFeesPeriods"/>
    </AccessFeesGroupList>
</xsl:variable>

<xsl:template match="/">
     <xsl:for-each select="xalan:nodeset($targetTree)/AccessFeesGroupList/AccessFeesGroup">
        <xsl:value-of select="../AccessFeesGroup[@groupType='B']/Period/@dateFrom"/>

    </xsl:for-each>
</xsl:template>


<xsl:template name="createAccessFeesPeriods">
    <xsl:for-each select="Document/Invoice/InvoiceItem[@CT='A']/AggSet/Att[@Ty='TM'][generate-id() = generate-id(key('by-id', @Id)[1])]">
      <xsl:variable name="SN_Id" select="../Att[@Ty='SN']/@Id"/>
      <xsl:variable name="groupTypeValue">
          <xsl:choose>
          <xsl:when test="$SN_Id='TEL'">B</xsl:when>
          <xsl:when test="$SN_Id='*ToDo /Configuration/Groupings/BundleServices *'">BUN</xsl:when>
          <xsl:when test="$SN_Id='*ToDo /Configuration/Groupings/P1Services *'">P1</xsl:when>
          <xsl:otherwise>P2</xsl:otherwise>
      </xsl:choose>
      </xsl:variable>
      <xsl:value-of select="$groupTypeValue"/> <AccessFeesGroup groupType="$groupTypeValue">
          <Period dateFrom='20080202' dateTo='' discountValue='' invoiceLineValue='' vatValue=''/>
      </AccessFeesGroup>
    </xsl:for-each>
</xsl:template>

Expected output: 20080202
Acutal output: No output ????????

Your program will produce no output if

xalan:nodeset($targetTree)/AccessFeesGroupList/AccessFeesGroup

selects no nodes.

Since you haven't shown us what's in $targetTree, we can't be expected to work out why this path expression selects nothing. Of course there might be other explanations as well.

Or perhaps $targetTree is really $VariantA? But now we're trying to debug a different program from the one you showed us. I'd rather go and play Sudoku.

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference

Please find the targetTree as follows,

<xsl:variable name="targetTree">
    <AccessFeesGroupList>
            <xsl:call-template name="createAccessFeesPeriods"/>
    </AccessFeesGroupList>
</xsl:variable>

<AccessFeesGroup groupType="$groupTypeValue">

should be

<AccessFeesGroup groupType="{$groupTypeValue}">

Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference