title: Can't increase the column header height in a Jasper report
body: <p>I get the following error when compiling:</p>
  
  <blockquote>
  <pre><code>[jrc] net.sf.jasperreports.engine.design.JRValidationException: Report design not valid :
    [jrc]      1. The title section, the page and column headers and footers and the margins do not fit the page height.
    [jrc]      2. The page and column headers and footers and the margins do not fit the page height.
    [jrc]      3. The page and column headers and footers and the margins do not fit the last page height.
  </code></pre>
  </blockquote>
  
  <p>The problem is with the following report:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;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="ReturnDeliveryNoteColumnHeader" pageWidth="555" pageHeight="30" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" whenResourceMissingType="Empty" uuid="4328d8a4-e5d5-4d7d-9fba-b42407325799"&gt;
      &lt;property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/&gt;
      &lt;columnHeader&gt;
          &lt;band height="30" splitType="Stretch"/&gt;
      &lt;/columnHeader&gt;
  &lt;/jasperReport&gt;
  </code></pre>
  
  <p>The problem occurs when the band height is increased above 30. Another report uses this report as a Subreport, in the Page Header band. I changed the height of the Page Header band, and the Subreport height within the Page Header to 50, but still get the error.</p>