Yes ... don't use the flag. Something along the lines of:

<xsl:template name="getOrderSource">
<xsl:for-each select="/ns0:Transaction-850/ns0:Loop-N1">
<xsl:choose>
<xsl:when test='ns0:Segment-N1/ns0:Element-66 = "21"'>NAEDI</xsl:when>
<xsl:otherwise>NAEDIBrokerage</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:template>
...
Thanks Ken. The problem with the above approach is that if there are 3 Loop-N1's
then the output would be:
<corecom:ID>NAEDIBrokerageNAEDIBrokerageNAEDIBrokerage</corecom:ID>

Thats why I was trying to set a flag inside the loop and then return a Single
value.

  <xsl:template name="getOrderSource">
    <xsl:choose>
      <xsl:when test='/ns0:Transaction-850/ns0:Loop-N1/
                      ns0:Segment-N1/ns0:Element-66 = "21"'>NAEDI</xsl:when>
      <xsl:otherwise>NAEDIBrokerage</xsl:otherwise>
    </xsl:choose>
  </xsl:template>

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