IReport 4.1.3 table component never shows the first entry of the dataset

I have a probably simple problem when using ireport table component. I'm using XML as the datasource for the report.

The problem is that the table never shows the first entry of the dataset associated with it.
Imagine I have this data:

<name>
   <first>adam 1</first>
   <last>sand 1</last>          
</name> 
<name>
   <first>adam 2</first>
   <last>sand 2</last>          
</name> 
<name>
   <first>adam 3</first>
   <last>sand 3</last>          
</name> 

The output (table) will be (all data except the first row):

first last
adam 2 sand 2
adam 3 sand 3

The report template:

<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="consumption_in_zones_data" pageWidth="500" pageHeight="802" columnWidth="500" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0">
    <property name="ireport.zoom" value="1.0"/>
    <property name="ireport.x" value="0"/>
    <property name="ireport.y" value="0"/>
    <property name="ireport.layers" value="##Tue Dec 06 12:01:43 GMT 2011\nlayer.0.name=Background\nlayer.0.visible=true\nlayer.0.id=0"/>
    <style name="table">
        <box>
            <pen lineWidth="1.0" lineColor="#000000"/>
        </box>
    </style>
    <style name="table_TH" mode="Opaque" backcolor="#F0F8FF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <style name="table_CH" mode="Opaque" backcolor="#999999">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <style name="table_TD" mode="Opaque" backcolor="#FFFFCC">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <style name="table 1">
        <box>
            <pen lineWidth="1.0" lineColor="#000000"/>
        </box>
    </style>
    <style name="table 1_TH" mode="Opaque" backcolor="#F0F8FF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <style name="table 1_CH" mode="Opaque" backcolor="#BFE1FF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <style name="table 1_TD" mode="Opaque" backcolor="#FFFFFF">
        <box>
            <pen lineWidth="0.5" lineColor="#000000"/>
        </box>
    </style>
    <subDataset name="table dataset">
        <parameter name="ZoneID" class="java.lang.String"/>
        <parameter name="PERIOD" class="java.lang.String"/>
        <parameter name="UNIT" class="java.lang.String"/>
        <queryString language="xPath">
            <![CDATA[/OrganizationData/Building/Zone/Indicator/ActiveEnergy[ZoneID='$P{ZoneID}']]]>
        </queryString>
        <field name="time" class="java.lang.String">
            <fieldDescription><![CDATA[time]]></fieldDescription>
        </field>
        <field name="consumption" class="java.lang.Double">
            <fieldDescription><![CDATA[consumption]]></fieldDescription>
        </field>
    </subDataset>
    <parameter name="ZoneID" class="java.lang.String"/>
    <parameter name="PERIOD" class="java.lang.String"/>
    <parameter name="UNIT" class="java.lang.String"/>
    <queryString language="xPath">
        <![CDATA[/OrganizationData/Building/Zone/Indicator/ActiveEnergy[ZoneID='$P{ZoneID}']]]>
    </queryString>
    <field name="time" class="java.lang.String">
        <fieldDescription><![CDATA[time]]></fieldDescription>
    </field>
    <field name="consumption" class="java.lang.Double">
        <fieldDescription><![CDATA[consumption]]></fieldDescription>
    </field>
    <variable name="consumption_1" class="java.lang.Double" resetType="Column" calculation="Sum">
        <variableExpression><![CDATA[$F{consumption}]]></variableExpression>
    </variable>
    <variable name="consumption_2" class="java.lang.Double" resetType="Column" calculation="Sum">
        <variableExpression><![CDATA[$F{consumption}]]></variableExpression>
    </variable>
    <background>
        <band splitType="Stretch"/>
    </background>
    <detail>
        <band height="197" splitType="Stretch">
            <componentElement>
                <reportElement key="table 1" style="table 1" x="0" y="0" width="500" height="197"/>
                <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
                    <datasetRun subDataset="table dataset">
                        <datasetParameter name="ZoneID">
                            <datasetParameterExpression><![CDATA[$P{ZoneID}]]></datasetParameterExpression>
                        </datasetParameter>
                        <datasetParameter name="PERIOD">
                            <datasetParameterExpression><![CDATA[$P{PERIOD}]]></datasetParameterExpression>
                        </datasetParameter>
                        <datasetParameter name="UNIT">
                            <datasetParameterExpression><![CDATA[$P{UNIT}]]></datasetParameterExpression>
                        </datasetParameter>
                        <dataSourceExpression><![CDATA[$P{REPORT_DATA_SOURCE}]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="90">
                        <jr:tableHeader style="table 1_TH" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="30"/>
                                <textElement textAlignment="Center"/>
                                <textFieldExpression><![CDATA[$P{PERIOD}]]></textFieldExpression>
                            </textField>
                        </jr:tableHeader>
                        <jr:detailCell style="table 1_TD" height="20" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="20"/>
                                <textElement textAlignment="Center"/>
                                <textFieldExpression><![CDATA[$F{time}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="90">
                        <jr:tableHeader style="table 1_TH" height="30" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="30"/>
                                <textElement textAlignment="Center"/>
                                <textFieldExpression><![CDATA[$P{UNIT}]]></textFieldExpression>
                            </textField>
                        </jr:tableHeader>
                        <jr:detailCell style="table 1_TD" height="20" rowSpan="1">
                            <textField>
                                <reportElement x="0" y="0" width="90" height="20"/>
                                <textElement textAlignment="Center"/>
                                <textFieldExpression><![CDATA[$F{consumption}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                </jr:table>
            </componentElement>
        </band>
    </detail>
</jasperReport>

Data snippet:

<OrganizationData>
  <Building>
    <BuildingID>71721890-efd1-012c-c545-0a48cbee2b22</BuildingID>
    <BuildingName>PT</BuildingName>
    <Tariff>low</Tariff>
    <Zone>
      <ZoneID>bceba570-d0e2-012e-d950-7ac0bc5389eb</ZoneID>
      <BuildingID>71721890-efd1-012c-c545-0a48cbee2b22</BuildingID>
      <ZoneName>PT - Zone A</ZoneName>
      <Type>ROUT</Type>
      <Indicator>
        <IndicatorID>96a41e20-60d8-012d-516c-5aacf9dbb012</IndicatorID>
        <ZoneID>bceba570-d0e2-012e-d950-7ac0bc5389eb</ZoneID>
        <BuildingID>71721890-efd1-012c-c545-0a48cbee2b22</BuildingID>
        <IndicatorName>EA+ BlA P0</IndicatorName>
        <ActiveEnergy>
          <IndicatorID>96a41e20-60d8-012d-516c-5aacf9dbb012</IndicatorID>
          <ZoneID>bceba570-d0e2-012e-d950-7ac0bc5389eb</ZoneID>
          <BuildingID>71721890-efd1-012c-c545-0a48cbee2b22</BuildingID>
          <time>01 Oct</time>
          <consumption>0.1</consumption>
        </ActiveEnergy>
        <ActiveEnergy>
          <IndicatorID>96a41e20-60d8-012d-516c-5aacf9dbb012</IndicatorID>
          <ZoneID>bceba570-d0e2-012e-d950-7ac0bc5389eb</ZoneID>
          <BuildingID>71721890-efd1-012c-c545-0a48cbee2b22</BuildingID>
          <time>02 Oct</time>
          <consumption>0.1</consumption>
        </ActiveEnergy>
      </Indicator>
    </Zone>
  </Building>
</OrganizationData>

thanks in advance,
Nuno