Resolving Variable Redefining Issues in a For Each

Hi,

Below are my XML and XSL

<Root>
   <Wrapper>
       <Detail>
           <Unit RecordID="1" Code="1" Total="2" />
           <Unit RecordID="1" Code="1" Total="2" />
           <Unit RecordID="1" Code="2" Total="2" />
           <Unit RecordID="1" Code="2" Total="2" />
           <Unit RecordID="1" Code="3" Total="2" />
           <Unit RecordID="2" Code="3" Total="2" />
           <Unit RecordID="2" Code="3" Total="2" />
           <Unit RecordID="2" Code="4" Total="2" />
           <Unit RecordID="2" Code="4" Total="2" />
        </Detail>
   </Wrapper>
</Root>

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
xmlns:script="urn:my-namespace">
        <xsl:template match="/">
                <xsl:element name="Root">

			<xsl:variable name="URecordID" 
select="/Root/Wrapper/Detail/Unit[not(./@RecordID=preceding::Unit/@RecordID)]"/>
                        <xsl:for-each select="$URecordID">
                                <xsl:variable name="thisRID" select="."/>
				<xsl:variable name="RecordIDCodes" 
select="/Root/Wrapper/Detail/Unit[./@RecordID=$thisRID/@RecordID]"/>
                                <xsl:element name="Record">

                                        <xsl:attribute name="Type">
                                                <xsl:value-of 
select="$thisRID/@RecordID"/>
                                        </xsl:attribute>

					<xsl:variable name="URecordIDCodes" 
select="$RecordIDCodes[not(./@Code=preceding::Unit/@Code)]"/>
                                        <xsl:for-each select="$URecordIDCodes">
                                                <xsl:variable name="thisCodes" 
select="."/>
						<xsl:variable name="UCode" 
select="$RecordIDCodes[./@Code=$thisCodes/@Code]"/>
                                                <xsl:element name="RCVCTN">
                                                        <xsl:attribute 
name="Code">
                                                                <xsl:value-of 
select="$thisCodes/@Code"/>
                                                        </xsl:attribute>
                                                        <xsl:attribute 
name="Total">
                                                                <xsl:value-of 
select="sum($UCode/@Total)"/>
                                                        </xsl:attribute>
                                                </xsl:element>
                                        </xsl:for-each>
                                </xsl:element>
                        </xsl:for-each>

                </xsl:element>
        </xsl:template>
</xsl:stylesheet>


This Should output the data first grouped by Record ID, Then By Unique Codes 
for that Record ID, totalling the Total column.
The problem is re assigning the variable in the for loop.  I know this is 
the problem and why, but want some help finding a work around.
If you run the xml and xsl as a test, you should see that the output should 
be:
Record Type 1
   Code - 1 Total - 4
   Code - 2 Total - 4
   Code - 3 Total - 2
Record Type 2
   Code - 3 Total - 4
   Code - 4 Total - 4

What i actually get is
Record Type 1
   Code - 1 Total - 4
   Code - 2 Total - 4
   Code - 3 Total - 2
Record Type 2
   Code - 4 Total - 4

As you can see, Code 3 is missing from record type 2.  This is because it 
has already occured for Record type 1 and cannot be reassigned in the 
variable.
I need to resolve this, and would appriciate some help

Thanks
Sian



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