xsl parent

i am using xsl:if in a for loop to filter out items with a certain item no.
this value is 10.
i want to display a sibling of the field in the filter.  How do I access a
sibling value from within the
if statement that qualifies I am in a certain node ?

i am using <xsl:value-of
select="preceding-sibling::node()[./@Name='QUANTITY']"/>

and it doesnt work.  Can someone correct my syntax or let me know an
alternate way of getting
just the value of QUANTITY for the record with PO_ITEM = 10?

thanks,
paul

here is my code:

     <xsl:variable name="POITEM">10</xsl:variable>
     <xsl:attribute name="quantity">
 		<xsl:for-each select="/Table[@Name =
'PO_ITEM_ACCOUNT_ASSIGNMENT']/Record/Parameter">
		 <xsl:if test="./@Name = 'PO_ITEM'">
		 <xsl:variable name="POITEMTEMP"><xsl:value-of select="."/></xsl:variable>
			 <xsl:if test="$POITEMTEMP=$POITEM">
			    <xsl:value-of
select="preceding-sibling::node()[./@Name='QUANTITY']"/>
			 </xsl:if>
		 </xsl:if>
		</xsl:for-each>
	 </xsl:attribute>


here is the xml:

 <Table Name="PO_ITEM_ACCOUNT_ASSIGNMENT">
      <Record>
        <Parameter Name="PO_ITEM" ><![CDATA[10]]></Parameter>
        <Parameter Name="SERIAL_NO"><![CDATA[0]]></Parameter>
        <Parameter Name="QUANTITY"><![CDATA[1.000]]></Parameter>
        <Parameter Name="DISTR_PERC"><![CDATA[0]]></Parameter>
      </Record>
</Table>

 <Table Name="PO_ITEM_ACCOUNT_ASSIGNMENT">
      <Record>
        <Parameter Name="PO_ITEM" ><![CDATA[10]]></Parameter>
        <Parameter Name="SERIAL_NO"><![CDATA[0]]></Parameter>
        <Parameter Name="QUANTITY"><![CDATA[1.000]]></Parameter>
        <Parameter Name="DISTR_PERC"><![CDATA[0]]></Parameter>
      </Record>
      <Record>
        <Parameter Name="PO_ITEM" ><![CDATA[20]]></Parameter>
        <Parameter Name="SERIAL_NO"><![CDATA[0]]></Parameter>
        <Parameter Name="QUANTITY"><![CDATA[1.000]]></Parameter>
        <Parameter Name="DISTR_PERC"><![CDATA[0]]></Parameter>
      </Record>
</Table>


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