Usage of key inside a for loop of a RTF does not work

<xsl:for-each
select="exslt:node-set($leverreference)/*">
		<xsl:variable name="referid" select="@levelref"/>
		
		<xsl:for-each
select="key('professionlevelkey','$referid')">
			<xsl:value-of select="@name"/>
		</xsl:for-each>
	</xsl:for-each>
The output of above does not produce any output.
The definition of professionlevelkey key is <xsl:key 
name="professionlevelkey" match="//professionlevel"
use="@id"/>

But if I use
<xsl:for-each
select="exslt:node-set($leverreference)/*">
		<xsl:variable name="referid" select="@levelref"/>
		
		<xsl:for-each select="//professionlevel">
<xsl:if test="$referid=@id">
			<xsl:value-of select="@name"/>
</xsl:if>
		</xsl:for-each>
	</xsl:for-each>
It gives correct  output.
Weird....not sure whatz wrong in usage of key inside
RTF..

regards,
Ranjan

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