basic-link FOPException

Hi,

I'm trying to create an internal-destination link and get this error:
org.apache.fop.apps.FOPException: internal-destination or
external-destination must be specified in basic-link

IThis is the block that's causing the error, and I can't see what's wrong
with the syntax:

<fo:block font-size="8pt" space-before.optimum="5pt">
<xsl:for-each select="../subjects/topic[string(.)]">
<fo:basic-link color="#0060A0"
internal-destination="{@topicID}"><xsl:value-of select="."/></fo:basic-link>
<xsl:if test="position()!=last()">; </xsl:if>	
</xsl:for-each>		
</fo:block>

With the basic-link tags commented out, the topics display correctly. 

Any help would be much appreciated!

Susan


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