Grouping of variables in XSLT 2.0 - xslt

Question

For each <LineDetail> node that has the same value of <CtryCd> and populates 1 <LineDetail> with the summation of <Amt>.
But, I need to check also the <SI> and <TI> node. The output tag of the summation will be based from the <SI> and <TI>
node. The <Amt1> will generate if the value of <SI> and <TI> are both false, while <Amt2> will generate if the value of <SI> is true and <TI> is false.
I created an XSLT and already got the summation. But there's still something missing in my output.
This is a sample XML:
<Record>
<Data>
<Process>
<Header>
<ID>22-BBB</ID>
<Date>2017-02-14</Date>
<ContactName>Abegail</ContactName>
<!-- some other elements -->
</Header>
<Detail>
<ID>22-CCC</ID>
<RequestedDate>2017-02-14</RequestedDate>
<!-- some other elements -->
<LineDetail>
<CtryCd>AF</CtryCd>
<SI>false</SI>
<TI>false</TI>
<Amt>11.11</Amt>
</LineDetail>
<LineDetail>
<CtryCd>SE</CtryCd>
<SI>true</SI>
<TI>false</TI>
<Amt>22.22</Amt>
</LineDetail>
<LineDetail>
<CtryCd>AF</CtryCd>
<SI>false</SI>
<TI>false</TI>
<Amt>33.33</Amt>
</LineDetail>
<LineDetail>
<CtryCd>AF</CtryCd>
<SI>true</SI>
<TI>false</TI>
<Amt>55.55</Amt>
</LineDetail>
</Detail>
</Process>
</Data>
</Record>
Generated output:
<Record>
<Data>
<Process>
<Header>
<ID>22-BBB</ID>
<Date>2017-02-14</Date>
<ContactName>Abegail</ContactName>
<!-- some other elements -->
</Header>
<Detail>
<LineDetail>
<CtryCd>AF</CtryCd>
<Amt1>99.99</Amt1>
</LineDetail>
</Detail>
<Detail>
<LineDetail>
<C<Amt2>22.22</Amt2>
</LineDetail>
</Detail>
</Process>
</Data>
</Record>
Expected output:
<Record>
<Data>
<Process>
<Header>
<ID>22-BBB</ID>
<Date>2017-02-14</Date>
<ContactName>Abegail</ContactName>
<!-- some other elements -->
</Header>
<Detail>
<ID>22-CCC</ID>
<RequestedDate>2017-02-14</RequestedDate>
<!-- some other elements -->
<LineDetail>
<CtryCd>AF</CtryCd>
<Amt1>44.44</<Amt1>
<Amt2>55.55</Amt2>
</LineDetail>
<LineDetail>
<CtryCd>SE</CtryCd>
<Amt1>0</<Amt1>
<Amt2>22.22</Amt2>
</LineDetail>
</Detail>
</Process>
</Data>
</Record>
XSLT:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:key name="CtryCd" match="LineDetail" use="CtryCd"/>
<!-- identity transform -->
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="Detail">
<xsl:for-each-group select="LineDetail" group-by="CtryCd">
<Detail>
<LineDetail>
<CtryCd>
<xsl:value-of select="CtryCd"/>
</CtryCd>
<xsl:if test="lower-case(SI)='false' and lower-case(TI)='false'">
<Amt1>
<xsl:value-of select="sum(current-group()/Amt)"/>
</Amt1>
<xsl:if test="lower-case(SI)='true' and lower-case(TI)='false'">
<Amt2>
<xsl:value-of select="sum(current-group()/Amt)"/>
</Amt2>
</xsl:if>
</xsl:if>
<xsl:if test="lower-case(SI)='true' and lower-case(TI)='false'">
<Amt2>
<xsl:value-of select="sum(current-group()/Amt)"/>
</Amt2>
</xsl:if>
</LineDetail>
</Detail>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>

Answer 1

You current if condition will only check the first item in the group. You really need it to be part of the actual sum statement, as a condition on each node on the group.
<Amt1>
<xsl:value-of select="sum(current-group()[lower-case(SI)='false' and lower-case(TI)='false']/Amt)"/>
</Amt1>
You would then have a similar statement for the Amt2, testing for "true" and "false"
Try this XSLT
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:key name="CtryCd" match="LineDetail" use="CtryCd"/>
<!-- identity transform -->
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="Detail">
<xsl:for-each-group select="LineDetail" group-by="CtryCd">
<Detail>
<LineDetail>
<CtryCd>
<xsl:value-of select="CtryCd"/>
</CtryCd>
<Amt1>
<xsl:value-of select="sum(current-group()[lower-case(SI)='false' and lower-case(TI)='false']/Amt)"/>
</Amt1>
<Amt2>
<xsl:value-of select="sum(current-group()[lower-case(SI)='true' and lower-case(TI)='false']/Amt)"/>
</Amt2>
</LineDetail>
</Detail>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>