xsl:for-each-group with a condition producing extra output - xslt

Question

I am working on to produce text output file from an xml. The XML entries will have a node called as LoanAmt whose value could be 0 or more than zero. Now, I have to check two conditions, first of which is to see if the value of LoanAmt is greater than 0, and then if it is I have to sum up the entries of LoanAmt if for unique Participant enntries. In other words if there is only one Participant ID in the whole xml then display the output but if there are more than one Partcipant ID then only one record for each unique Particpant ID should be populated but the LoanAmt within each unique Particpant ID should be summed up and displayed. My issue is that my xslt is working the same way as I want but the groupby and if condition is not working on the first entry of xml where Loan Amt is not greater than zero. So, the first entry that I am getting is being displayed with zero amount and this line should not appear.
This is the XML which is not the complete set but I have taken a sample out of the original one :
<?xml version='1.0' encoding='UTF-8'?>
<Report_Data >
<Report_Entry>
<Participant_ID>033</Participant_ID>
<chk>673.58</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Vana</Last_Name>
<First_Name>Sag</First_Name>
<Middle_Name>N</Middle_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>100.8</PreTaxAmt>
<MatchAmt>100.8</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>037</Participant_ID>
<chk>2167.89</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Pilay</Last_Name>
<First_Name>Saath</First_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>61.81</PreTaxAmt>
<MatchAmt>61.81</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>043</Participant_ID>
<chk>819.78</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>ouphan</Last_Name>
<First_Name>angmala</First_Name>
<Gender_Code>2</Gender_Code>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>84.19</PreTaxAmt>
<MatchAmt>84.18</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>049</Participant_ID>
<chk>2066.54</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Tizili</Last_Name>
<First_Name>ard</First_Name>
<Gender_Code>1</Gender_Code>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>136.37</PreTaxAmt>
<MatchAmt>136.36</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>094</Participant_ID>
<chk>946.71</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>holphakdy</Last_Name>
<First_Name>Meya</First_Name>
<Gender_Code>2</Gender_Code>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>81.25</PreTaxAmt>
<MatchAmt>81.25</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>104</Participant_ID>
<chk>1183.3</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Sai</Last_Name>
<First_Name>Paupl</First_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>234.52</PreTaxAmt>
<MatchAmt>234.52</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>128.18</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>106</Participant_ID>
<chk>185.44</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Leve</Last_Name>
<First_Name>Alen</First_Name>
<Middle_Name>S</Middle_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>61.48</PreTaxAmt>
<MatchAmt>61.47</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>106</Participant_ID>
<chk>0</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Leve</Last_Name>
<First_Name>Alen</First_Name>
<Middle_Name>S</Middle_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>0</PreTaxAmt>
<MatchAmt>0</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>10</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>131</Participant_ID>
<chk>508.92</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>th</Last_Name>
<First_Name>Pa</First_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>0</PreTaxAmt>
<MatchAmt>0</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>153</Participant_ID>
<chk>277.2</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Baer</Last_Name>
<First_Name>Er</First_Name>
<Middle_Name>D</Middle_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>72.39</PreTaxAmt>
<MatchAmt>72.38</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>155</Participant_ID>
<chk>1250.83</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>Piye</Last_Name>
<First_Name>Shirit</First_Name>
<Middle_Name>M</Middle_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>0</PreTaxAmt>
<MatchAmt>0</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>96.3</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>170</Participant_ID>
<chk>0</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>terner</Last_Name>
<First_Name>san</First_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>0</PreTaxAmt>
<MatchAmt>0</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>0</LoanAmt>
</Report_Entry>
<Report_Entry>
<Participant_ID>170</Participant_ID>
<chk>684.05</chk>
<Workers>
<FULL_PART_Time_Indicator>1</FULL_PART_Time_Indicator>
<Last_Name>terner</Last_Name>
<First_Name>san</First_Name>
</Workers>
<End_Date_from_Pay_Period>2016-01-03-08:00</End_Date_from_Pay_Period>
<PreTaxAmt>162.31</PreTaxAmt>
<MatchAmt>162.3</MatchAmt>
<RothAmt>0</RothAmt>
<LoanAmt>210.98</LoanAmt>
</Report_Entry>
I am putting my xslt that I have used :
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
version="2.0" xmlns:functx="http://www.functx.com" >
<xsl:variable name="linefeed" select="'
'"/>
<xsl:variable name="filler" select="' '"/>
<xsl:variable name="separator" select="','"/>
<xsl:variable name="spaces"
select="concat(' ',' ',' ',' ',' ',' ',' ',' ',' ')"/>
<xsl:template match="/">
<xsl:call-template name="LoanDataRecord"/>
</xsl:template>
<xsl:template name="LoanDataRecord">
<xsl:for-each-group select="Report_Data/Report_Entry" group-by="if( LoanAmt[. > 0 ] ) then Participant_ID else '' " >
<xsl:variable name="Var1" select="current-grouping-key()"/>
<!-- Plan Number -->
<xsl:value-of select="substring(concat('768002',$filler),1,6)"/>
<xsl:value-of select="$separator"/>
<!-- Participant Number -->
<xsl:value-of select="substring(concat(Participant_ID,$filler),1,9)"/>
<xsl:value-of select="$separator"/>
<!-- Loan Amt -->
<xsl:value-of select="(sum(current-group()/LoanAmt))"/>
<xsl:value-of select="$linefeed"/>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>
768002,033709571,0
768002,104603206,128.18
and so on
But I do not want to see the first line which has 0 LoanAmt.

Answer 1

The problem is the <xsl:for-each-group /> instruction. Change it to use a predicate:
<xsl:for-each-group select="Report_Data/Report_Entry[LoanAmt > 0 ]"
group-by="Participant_ID">
I tested it with your XML, and it works: http://xsltransform.net/bnnZWu.
By the way, I added <xsl:output method="text" />, as that's what you probably want.