Jasperreports多个子报告重叠

我有一个主要的详细信息与2个子报告背靠背vertically他们没有太多的空间，因为主报告是相当长的....我已经在子报告中指定FLOAT属性一切工作顺利，当数据都填充在空间中分配它在IREPORT，但是当他们有很多行我的意思是3 or more rows第二个子报表Materiales重叠下一个组件...我想如果一些子报表需要更多的空间，它会推下一个组件。 TRABAJOS REALIZADOS是Frame with Float property，但是没有按下框架保持的位置和重叠由Materiales sub-report..Jasperreports多个子报告重叠

我的ireport设计。

enter image description here

my source code some tags are ommited by brevity

<detail> 
    <band height="770" splitType="Stretch"> 
     .... others tags ommited by brevity 
     <frame> 
      <reportElement positionType="Float" x="0" y="401" width="554" height="70"/> 
      <subreport runToBottom="false"> 
       <reportElement positionType="Float" x="1" y="1" width="553" height="69"/> 
       <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{munichs})]]></dataSourceExpression> 
       <subreportExpression class="java.io.InputStream"><![CDATA[$P{SUBREPORT_EXPRESSION}]]></subreportExpression> 
      </subreport>     
     </frame> 
     <frame> 
      <reportElement positionType="Float" x="2" y="472" width="551" height="128"/> 
      <subreport runToBottom="false"> 
       <reportElement positionType="Float" x="1" y="44" width="545" height="83"/> 
       <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{venices})]]></dataSourceExpression> 
       <subreportExpression class="java.io.InputStream"><![CDATA[$P{SUBREPORT_EXPRESSION_SECOND_REPORT}]]></subreportExpression> 
      </subreport> 
        </frame>    
     <frame><!--this frame is not pushed down and gets overlapped...--> 
      <reportElement positionType="Float" x="0" y="599" width="554" height="171"/> 
      <rectangle> 
       <reportElement x="2" y="1" width="180" height="20"/> 
      </rectangle> 
      <staticText> 
       <reportElement x="2" y="1" width="178" height="20"/> 
       <textElement/> 
       <text><![CDATA[TRABAJOS PENDIENTES]]></text> 
      </staticText> 
      <rectangle> 
       <reportElement x="2" y="21" width="550" height="38"/> 
      </rectangle> 
      <textField> 
       <reportElement x="3" y="21" width="551" height="38"/> 
       <textElement/> 
       <textFieldExpression class="java.lang.String"><![CDATA[$F{observations}]]></textFieldExpression> 
      </textField> 
      <staticText> 
       <reportElement x="2" y="64" width="100" height="20"/> 
       <textElement/> 
       <text><![CDATA[FIRMA OPERADOR: ]]></text> 
      </staticText> 
      <staticText> 
       <reportElement x="333" y="64" width="107" height="20"/> 
       <textElement/> 
       <text><![CDATA[CONFORME CLIENTE:]]></text> 
      </staticText> 
      <image> 
       <reportElement x="442" y="63" width="22" height="22"/> 
       <imageExpression class="java.io.InputStream"><![CDATA[$F{sign}]]></imageExpression> 
      </image> 
      <staticText> 
       <reportElement x="188" y="90" width="66" height="20"/> 
       <textElement/> 
       <text><![CDATA[FIRMA Y DNI:]]></text> 
      </staticText> 
      <image> 
       <reportElement x="257" y="89" width="22" height="22"/> 
       <imageExpression class="java.io.InputStream"><![CDATA[$F{conformity}]]></imageExpression> 
      </image> 
      <image> 
       <reportElement x="281" y="89" width="264" height="32"/> 
       <imageExpression class="java.io.InputStream"><![CDATA[$F{imageForSign}]]></imageExpression> 
      </image> 
      <textField> 
       <reportElement x="2" y="122" width="543" height="49"/> 
       <textElement/> 
       <textFieldExpression class="java.lang.String"><![CDATA[$P{lopd}]]></textFieldExpression> 
      </textField> 
     </frame> 


    </band> 
</detail>

我IReport image

enter image description here 我与重叠PDF ..