I've got the following XML fragment repeated multiple times:
<SKU_INFO>
    <DETAIL_SEQ_NUMBER>11</DETAIL_SEQ_NUMBER>
    <SKU_TIE>1</SKU_TIE>
    <SKU_NUMBER>223344</SKU_NUMBER>
    <SKU_QUANTITY>2</SKU_QUANTITY>
    <MFG_PART_NUM>1234A</MFG_PART_NUM>
    <ITEM_TYPE_CODE>N</ITEM_TYPE_CODE>
    <SKU_DESCRIPTION>SI,MOD</SKU_DESCRIPTION>
    <BASE_SKU_FLAG>y</BASE_SKU_FLAG>
  </SKU_INFO>
  <SKU_INFO>
    <DETAIL_SEQ_NUMBER>11</DETAIL_SEQ_NUMBER>
    <SKU_TIE>1</SKU_TIE>
    <SKU_NUMBER>113344</SKU_NUMBER>
    <SKU_QUANTITY>2</SKU_QUANTITY>
    <MFG_PART_NUM>1234A</MFG_PART_NUM>
    <ITEM_TYPE_CODE>6</ITEM_TYPE_CODE>
    <SKU_DESCRIPTION>MOD</SKU_DESCRIPTION>
    <BASE_SKU_FLAG />
  </SKU_INFO>
  <SKU_INFO>.....
I'm attempting to group by the SKU_NUMBER element using keys but have been unable to get this to work. Here's my xslt:
<ROWSET>
    <xsl:for-each select="SKU_INFO[count(. | key('sku_num', SKU_NUMBER)[1]) = 1]" >
	<ROW> 					
		<xsl:attribute name="num">
      		<xsl:value-of select="position()"/> 
   		</xsl:attribute>
   	<ROW> 
	<HEADER_ID>
		<xsl:value-of select="/CustomerOrder/headerID" />
	</HEADER_ID>
        <DETAIL_SEQ_NUMBER>
		<xsl:value-of select="./DETAIL_SEQ_NUMBER" />
	</DETAIL_SEQ_NUMBER>
	<SKU_TIE>
		<xsl:value-of select="./SKU_TIE" />
	</SKU_TIE>
	<SKU_NUMBER>
		<xsl:value-of select="./SKU_NUMBER" />
	</SKU_NUMBER>
	<SKU_QTY>
		<xsl:value-of select="./SKU_QUANTITY" />
	</SKU_QTY>
	<MFG_PART_NUM>
		<xsl:value-of select="./MFG_PART_NUM" />
	</MFG_PART_NUM>
	<ITEM_TYPE_CODE>
		<xsl:value-of select="./ITEM_TYPE_CODE" />
	</ITEM_TYPE_CODE>
	<SKU_DESCRIPTION>
		<xsl:value-of select="./SKU_DESCRIPTION" />
	</SKU_DESCRIPTION>
	<BASE_SKU_FLAG>
		<xsl:choose>
		<xsl:when test="./BASE_SKU_FLAG='Y' " >
			<xsl:text>1</xsl:text>
		</xsl:when>
		<xsl:otherwise>
			<xsl:text>0</xsl:text>
		</xsl:otherwise>
		</xsl:choose>
	</BASE_SKU_FLAG>
	<UPDATE_DATE>
		<xsl:value-of select="$updateDate" />
	</UPDATE_DATE> 
     	</ROW>
</xsl:for-each> 
</ROWSET>

Any help is greatly appreciated, thanks.
MEC6304