Yes... I found it...
Now it works...

But I need to implement it sorting by a variable..
I need to sort By $totale and display the $totale value.
In this way are not displaying the $totale values.


<xsl:template match="/">
<xsl:call-template name="positionfilter"> <xsl:with-param
name="sortedlist"> <xsl:for-each
select="/CommandList/CheckRouting/RouterList/Router/GroupList/Group/OutwardList/Outward"
> <xsl:variable name="root" select="../../ReturnList/Return" />

<xsl:variable name="totale">
<xsl:choose>
<xsl:when test="Price/Amount">
<xsl:value-of
select="format-number(number(Price/Amount)+number($root/Price/Amount),'#.##')"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="//Group/Price/Amount/text()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>

<xsl:copy-of select="."/>
</xsl:for-each>
</xsl:with-param>
</xsl:call-template>
</xsl:template>


<xsl:template name="positionfilter">
<xsl:param name="sortedlist"/>
<xsl:param name="totale"/>
<xsl:for-each select="msxsl:node-set($sortedlist)/*">
<xsl:sort select="$totale"/>
<xsl:value-of select="$totale"></xsl:value-of><br/>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>