JRXML - Eliminating repeated header on the bottom - jasper-reports

Question

We've got a problem when printing some PDF reports using JasperReports. These reports are basically a breakdown of all the sales made to a specific client over the course of the years.
We take information from a DB, transform it using Java, and print the reports in PDF. The problem is, in some rare cases, some headers appear repeated at the bottom of each page:
Ideally, we should be able to omit that loose header and keep only the one on the new page, but I can't seem to do it, at least via TIBCO Jaspersoft Studio.
I don't actually know much about these reports, but any information you need to help, feel free to ask.
Thanks in advance.
EDIT: Following Petter Friberg's comment, here's parts of the JRXML being used in this report. I omitted some parts that follow the same properties, but i think this should be clear enough.
<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="Historique" language="groovy" pageWidth="595" pageHeight="842" columnWidth="483" leftMargin="56" rightMargin="56" topMargin="43" bottomMargin="43" isSummaryWithPageHeaderAndFooter="true" resourceBundle="reportLabels" whenResourceMissingType="Empty" uuid="80db05e1-8ca3-483d-86cc-5947dc62296b">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<property name="com.jaspersoft.studio.unit." value="pixel"/>
<property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
<property name="com.jaspersoft.studio.unit.topMargin" value="mm"/>
<property name="com.jaspersoft.studio.unit.bottomMargin" value="mm"/>
<property name="com.jaspersoft.studio.unit.leftMargin" value="mm"/>
<property name="com.jaspersoft.studio.unit.rightMargin" value="mm"/>
<property name="com.jaspersoft.studio.unit.pageHeight" value="pixel"/>
<property name="com.jaspersoft.studio.unit.pageWidth" value="pixel"/>
<property name="com.jaspersoft.studio.unit.columnWidth" value="pixel"/>
<property name="com.jaspersoft.studio.unit.columnSpacing" value="pixel"/>
<template><![CDATA["/jasper/styles_letter.jrtx"]]></template>
<style name="Table Group Header" mode="Opaque" forecolor="#000000" backcolor="#99CCFF" vTextAlign="Middle" fontName="Arial" fontSize="10" isBold="true" pdfFontName="Helvetica-Bold"/>
<!-- ... multiple styles -->
<parameter name="title" class="java.lang.String"/>
<!-- ... multiple parameters-->
<parameter name="addressCity" class="java.lang.String"/>
<field name="reduction" class="java.lang.String">
<fieldDescription><![CDATA[reduction]]></fieldDescription>
</field>
<!-- ... multiple fields -->
<field name="year" class="java.lang.String"/>
<group name="DescriptionGroup">
<groupExpression><![CDATA[$F{year}]]></groupExpression>
<groupHeader>
<band height="30">
<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
<textField evaluationTime="Group" evaluationGroup="DescriptionGroup" bookmarkLevel="2">
<reportElement style="Table Group Header" mode="Opaque" x="0" y="0" width="483" height="15" printWhenGroupChanges="DescriptionGroup" backcolor="#B0B0B0" uuid="f626bb36-a919-48b9-98b3-756d1ce9812b">
<property name="local_mesure_unitx" value="pixel"/>
<property name="com.jaspersoft.studio.unit.x" value="px"/>
<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
<printWhenExpression><![CDATA[new Boolean($P{emptyList} != true)]]></printWhenExpression>
</reportElement>
<box leftPadding="10">
<topPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
</box>
<textElement markup="none">
<font size="9" isBold="true"/>
</textElement>
<textFieldExpression><![CDATA[$F{year}]]></textFieldExpression>
</textField>
<!-- ... multiple text fields following the same principle -->
</band>
</groupHeader>
</group>
<background>
<band splitType="Stretch"/>
</background>
<title>
<!-- this only appears in the first page, has all the customer info -->
</title>
<columnHeader>
<band splitType="Stretch"/>
</columnHeader>
<detail>
<band height="25" splitType="Stretch">
<property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.HorizontalRowLayout"/>
<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
<textField pattern="" isBlankWhenNull="true">
<reportElement style="Zebra" mode="Opaque" x="0" y="0" width="130" height="25" uuid="234d3832-bd30-40a0-b8e5-eac964158000">
<property name="local_mesure_unitheight" value="pixel"/>
<property name="local_mesure_unitx" value="pixel"/>
<property name="com.jaspersoft.studio.unit.x" value="px"/>
<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
<printWhenExpression><![CDATA[new Boolean($P{emptyList} != true)]]></printWhenExpression>
</reportElement>
<textElement>
<font size="8" isBold="false"/>
<paragraph leftIndent="3"/>
</textElement>
<textFieldExpression><![CDATA[$F{article}]]></textFieldExpression>
</textField>
<!-- ... multiple fields following the same principle. this is the body of each sub-table, showing the info for each year -->
</band>
</detail>
<pageFooter>
<band height="25" splitType="Stretch">
<!-- ... -->
</band>
</pageFooter>
<summary>
<band height="40" splitType="Stretch">
<!-- ... shows a summary of all the info shown on each table -->
</band>
</summary>
</jasperReport>
Thanks in advance.

Answer 1

You are using a group the generate the header, so you can use this attribute minHeightToStartNewPage, to determine how much space needs to remain otherwise break to new page.
<group name="DescriptionGroup" minHeightToStartNewPage="60">
or if you like to force it to always start on new page
<group name="DescriptionGroup" isStartNewPage="true">