Defining a variable for configuration file

Hi 

Could someone help me with this. I am defining the variable in a template
but looks like the $Config is not being recognized. 
I am getting error  'XSL transformation failed due to following error:
Invalid variable referenceErrror in XPath expression, invalid variable
reference" 

thanks
Harsha 



<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

        <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"
doctype-system="urn:/ShipmentOrderCreate.dtd"/>
        

          <xsl:template match="/">
          

                <xsl:if test="//storerkey = '1011'">

                        <xsl:variable name="Config" select=
"document('1011CustomerConfig.xml')"/>

                </xsl:if>
        

                        <xsl:element name="ShipmentOrderCreate">
                                                                
                                <xsl:element
name="CustomerCode"><xsl:value-of
select="$Config/ConfigurationFile/CustomerCode">
</xsl:value-of> </xsl:element>

                        </xsl:element>

        </xsl:template>

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