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    copied!<p>Edit: Updated my XSLT to accommodate OP's request to insert totals into the original XML. The trick to solving the problem is to use the identity template and a global variable.</p> <p>If you use this XSLT:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:key name="KType" match="Basisproduct" use="."/&gt; &lt;xsl:output indent="yes"/&gt; &lt;xsl:strip-space elements="*"/&gt; &lt;!-- create a variable w/ the calculated totals --&gt; &lt;xsl:variable name="CalculatedTotals"&gt; &lt;xsl:for-each select="*/*/*/Basisproduct [generate-id() = generate-id(key ('KType', .)[1])]"&gt; &lt;xsl:element name="TotalProduct"&gt; &lt;xsl:element name="Basisproduct"&gt; &lt;xsl:value-of select= "."/&gt; &lt;/xsl:element&gt; &lt;xsl:element name="Cumul_Amount"&gt; &lt;xsl:value-of select= "/*/*/*[Basisproduct = current()][last()]/CustInvoice_LineAmount + sum(/*/*/*[Basisproduct = current()][last()]/preceding-sibling::*/CustInvoice_LineAmount)"/&gt; &lt;/xsl:element&gt; &lt;/xsl:element&gt; &lt;/xsl:for-each&gt; &lt;/xsl:variable&gt; &lt;!-- identity --&gt; &lt;xsl:template match="node()|@*"&gt; &lt;xsl:copy&gt; &lt;xsl:apply-templates select="node()|@*"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;!-- root --&gt; &lt;xsl:template match="/"&gt; &lt;xsl:apply-templates select="node()|@*"/&gt; &lt;/xsl:template&gt; &lt;xsl:template match="Totals"&gt; &lt;xsl:copy&gt; &lt;!-- insert the calculated totals --&gt; &lt;xsl:copy-of select="$CalculatedTotals"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>You will get this XML output:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;Report Name="SalesInvoice"&gt; &lt;ReportName&gt;SalesInvoice&lt;/ReportName&gt; &lt;Invoice&gt; &lt;InvoicingName&gt;Test Company&lt;/InvoicingName&gt; &lt;/Invoice&gt; &lt;ConditionalArea&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;110&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;1.52&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;198&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;20.11&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;198&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;20.22&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;992&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;30.33&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;993&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;30.34&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;992&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;30.35&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;992&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;30.45&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;993&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;30.46&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;BodyCustInvoice&gt; &lt;Basisproduct&gt;198&lt;/Basisproduct&gt; &lt;CustInvoice_LineAmount&gt;100.99&lt;/CustInvoice_LineAmount&gt; &lt;/BodyCustInvoice&gt; &lt;/ConditionalArea&gt; &lt;Totals&gt; &lt;TotalProduct&gt; &lt;Basisproduct&gt;110&lt;/Basisproduct&gt; &lt;Cumul_Amount&gt;1.52&lt;/Cumul_Amount&gt; &lt;/TotalProduct&gt; &lt;TotalProduct&gt; &lt;Basisproduct&gt;198&lt;/Basisproduct&gt; &lt;Cumul_Amount&gt;294.77&lt;/Cumul_Amount&gt; &lt;/TotalProduct&gt; &lt;TotalProduct&gt; &lt;Basisproduct&gt;992&lt;/Basisproduct&gt; &lt;Cumul_Amount&gt;163.32&lt;/Cumul_Amount&gt; &lt;/TotalProduct&gt; &lt;TotalProduct&gt; &lt;Basisproduct&gt;993&lt;/Basisproduct&gt; &lt;Cumul_Amount&gt;193.78000000000003&lt;/Cumul_Amount&gt; &lt;/TotalProduct&gt; &lt;/Totals&gt; &lt;/Report&gt; </code></pre> <p>Tested with Oxygen 12 on Win 7.</p>
 

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