i am trying to write XSLT mapping to move Segments to its corresponding header segment based on key field matches in (key field name ) and (key field name ) segments (MAT=IDEN), If key field not matches then no need to pass segment, i have written XSLT, but its not giving required transformation.

i attached sample input and output as below. Please check.

Input:

<?xml version="1.0" encoding="UTF-8"?>
<HEADER>
    <CODI BEGIN="1">
        <L20 SEGMENT="1">
            <ELN>Value1</ELN>       
            <L24 SEGMENT="1">           
                <MAT>12345</MAT>
                <ITEM SEGMENT="1">
                    <IDEN>12345</IDEN>
                    <Fields>00</Fields>
                </ITEM>
                <ITEM SEGMENT="1">                  
                    <IDEN>45678</IDEN>
                    <Fields>10</Fields>
                </ITEM>
                <ITEM SEGMENT="1">                  
                    <IDEN>45678</IDEN>
                    <Fields>11</Fields>
                </ITEM>
                <ITEM SEGMENT="1">              
                    <IDEN>667788</IDEN>
                    <Fields>12</Fields>
                 </ITEM>
                <ITEM SEGMENT="1">                  
                    <IDEN>667788</IDEN>
                    <Fields>13</Fields>
                </ITEM>
                <ITEM SEGMENT="1">              
                    <IDEN>112233</IDEN>
                    <Fields>20</Fields>
                </ITEM>
                <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>          
            </L24>
            <L24 SEGMENT="1">               
                <MAT>45678</MAT>                
                <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>          
            </L24>
            
            <L24 SEGMENT="1">               
                <MAT>60987</MAT>                
                <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>
            </L24>
            <L24 SEGMENT="1">               
                <MAT>667788</MAT>               
                <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>
                </L24>
            
            <L24 SEGMENT="1">
                <MAT>112233</MAT>               
                <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>
        
            </L24>
            
        </L20>
    </CODI>
</HEADER>

** Desired Output:**

<?xml version="1.0" encoding="UTF-8"?>
<HEADER>
    <CODI BEGIN="1">
        <L20 SEGMENT="1">
            <ELN>Value1</ELN>       
            <L24 SEGMENT="1">           
                <MAT>12345</MAT>
                <ITEM SEGMENT="1">
                    <IDEN>12345</IDEN>
                    <Fields>00</Fields>
                </ITEM>     
            
                <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>          
            </L24>
            <L24 SEGMENT="1">               
                <MAT>45678</MAT>                
                    
              <ITEM SEGMENT="1">                    
                    <IDEN>45678</IDEN>
                    <Fields>10</Fields>
                </ITEM>
                <ITEM SEGMENT="1">                  
                    <IDEN>45678</IDEN>
                    <Fields>11</Fields>
                </ITEM> 
                              <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>          
            </L24>
            
            <L24 SEGMENT="1">               
                <MAT>60987</MAT>                
                <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>
            </L24>
            <L24 SEGMENT="1">               
                <MAT>667788</MAT>               
                            
                    <ITEM SEGMENT="1">              
                    <IDEN>667788</IDEN>
                    <Fields>12</Fields>
                 </ITEM>
                <ITEM SEGMENT="1">                  
                    <IDEN>667788</IDEN>
                    <Fields>13</Fields>
                </ITEM>
                               <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>
                </L24>
            
            <L24 SEGMENT="1">
                <MAT>112233</MAT>               
                
                    <ITEM SEGMENT="1">              
                    <IDEN>112233</IDEN>
                    <Fields>20</Fields>
                </ITEM>
                               <L19 SEGMENT="1">
                    <LF>Value2</LF>
                </L19>
        
            </L24>
            
        </L20>
    </CODI>
</HEADER>

** XSLT I used is below:**

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 
  <xsl:key name="child-by-key" match="child" use="@IDEN" />
  
  <!-- Identity template to copy all nodes as-is -->
  <xsl:template match="@* | node()">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()"/>
    </xsl:copy>
  </xsl:template>
  
  <xsl:template match="//L24">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()"/>
    
      <xsl:for-each select="key('child-by-key', @IDEN)">
        <xsl:copy-of select="."/>
      </xsl:for-each>
    </xsl:copy>
  </xsl:template>

</xsl:stylesheet>

Please assist here.