Aggregation with XSLT

Question

I have the target /aggregate-rating.xml

<aggregate>
    <rating>
        <issuerNumber>388d</issuerNumber>
        <WAABCA>baa1</WAABCA>
        <WAABCANumeric>14.2</WAABCANumeric>
        <WANotches>3.4</WANotches>
        <WALTRatingNumeric>17.6</WALTRatingNumeric>
</rating>
    <rating>
        <issuerNumber>89f8</issuerNumber>
        <WAABCA>b2</WAABCA>
        <WAABCANumeric>7.4</WAABCANumeric>
        <WANotches>-1.6</WANotches>
        <WALTRatingNumeric>5.8</WALTRatingNumeric>
</rating>
===================================
</aggregate>

Mapping /rating-chart.xml

<ratings>
      <rating MD="Aaa" SP="AAA" Grade="Investment" rank="1"/>
==================================
      <rating MD="A1" SP="A+" Grade="Investment" rank="5"/>
      <rating MD="A2" SP="A" Grade="Investment" rank="6"/>
      <rating MD="A3" SP="A-" Grade="Investment" rank="7"/>                        
      <rating MD="Baa1" SP="BBB+" Grade="Investment" rank="8"/>
========================
      <rating MD="B2" SP="B" Grade="Non-Investment" rank="15"/>
      <rating MD="B3" SP="B-" Grade="Non-Investment" rank="16"/>
      <rating MD="Caa1" SP="CCC" Grade="Non-Investment" rank="17"/>
====================================
      <rating MD="C" Grade="Non-Investment" rank="21"/>                        
</ratings>

The scale is based on WANotches. e.g issuer 388d, its WAABCA is baa1 (rank 8) then it notches 3.4 (round to 3), its rank is boosted to 5. The adjusted rating will be <rating MD="A1" SP="A+" Grade="Investment" rank="5"/>

Expected result:

<aggregate>
   <rating>
      <issuerNumber>388d</issuerNumber>
      <WAABCA>baa1</WAABCA>
      <WAABCANumeric>14.2</WAABCANumeric>
      <WANotches>3.4</WANotches>
      <WALTRatingNumeric>17.6</WALTRatingNumeric>
      <adjustedMoody>A1</adjustedMoody>
      <adjustedStandardPoor>A+</adjustedStandardPoor>
      <adjustedGrade>Investment</adjustedGrade>
   </rating>
   <rating>
      <issuerNumber>89f8</issuerNumber>
      <WAABCA>b2</WAABCA>
      <WAABCANumeric>7.4</WAABCANumeric>
      <WANotches>-1.6</WANotches>
      <WALTRatingNumeric>5.8</WALTRatingNumeric>
      <adjustedMoody>Caa1</adjustedMoody>
      <adjustedStandardPoor>CCC</adjustedStandardPoor>
      <adjustedGrade>Non-Investment</adjustedGrade>
   </rating>
=======================================
</aggregate>

My xsl:

    <xsl:variable name="ratingChart" select="doc('/rating-chart.xml')"/>
 
    <xsl:template match="rating">
       <xsl:variable name="notch" select="round(WANotches)"/>
       <xsl:variable name="currentRank" select="$ratingChart/ratings/rating[upper-case(@MD) eq upper-case(WAABCA)]/@rank"/>      
       <xsl:variable name="notchRank" select="$currentRank - $notch"/>
 
       <xsl:variable name="aggRank" select="$ratingChart/ratings/rating[@rank = $notchRank]"/>         
 
       <xsl:variable name="adjustedMD" select="$aggRank/@MD"/>
       <xsl:variable name="adjustedSP" select="$aggRank/@SP"/>
       <xsl:variable name="adjustedGrade" select="$aggRank/@Grade"/>         
        <xsl:copy>
            <xsl:sequence select="$aggRank"/>
            <xsl:apply-templates/>
            <xsl:call-template name="aggrRating">
                <xsl:with-param name="aMD" select="$adjustedMD"/>
                <xsl:with-param name="aSP" select="$adjustedSP"/>
                <xsl:with-param name="aGrade" select="$adjustedGrade"/>
            </xsl:call-template>
        </xsl:copy>
    </xsl:template>
   
    <xsl:template name="aggrRating">
        <xsl:param name="aMD"/>
        <xsl:param name="aSP"/>
        <xsl:param name="aGrade"/>
        <adjustedMoody><xsl:value-of select="$aMD"/></adjustedMoody>       
        <adjustedStandardPoor><xsl:value-of select="$aSP"/></adjustedStandardPoor>
        <adjustedGrade><xsl:value-of select="$aGrade"/></adjustedGrade>
    </xsl:template>
   
    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates/>
        </xsl:copy>
</xsl:template>

I got all the blank elements : <adjustedMoody>, <adjustedStandardPoor>, <adjustedGrade>.

How can I fix my xsl?