Index: src/ooxml/testcases/org/apache/poi/xslf/TestXSLFBugs.java
===================================================================
--- src/ooxml/testcases/org/apache/poi/xslf/TestXSLFBugs.java	(revision 1751647)
+++ src/ooxml/testcases/org/apache/poi/xslf/TestXSLFBugs.java	(working copy)
@@ -30,10 +30,16 @@
 import java.awt.geom.AffineTransform;
 import java.awt.geom.Rectangle2D;
 import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.net.URI;
 import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
 
 import javax.imageio.ImageIO;
 
@@ -47,10 +53,13 @@
 import org.apache.poi.sl.usermodel.PictureData.PictureType;
 import org.apache.poi.sl.usermodel.ShapeType;
 import org.apache.poi.sl.usermodel.VerticalAlignment;
+import org.apache.poi.ss.util.CellRangeAddress;
+import org.apache.poi.ss.util.CellReference;
 import org.apache.poi.xslf.usermodel.DrawingParagraph;
 import org.apache.poi.xslf.usermodel.DrawingTextBody;
 import org.apache.poi.xslf.usermodel.XMLSlideShow;
 import org.apache.poi.xslf.usermodel.XSLFAutoShape;
+import org.apache.poi.xslf.usermodel.XSLFChart;
 import org.apache.poi.xslf.usermodel.XSLFHyperlink;
 import org.apache.poi.xslf.usermodel.XSLFPictureData;
 import org.apache.poi.xslf.usermodel.XSLFPictureShape;
@@ -60,8 +69,26 @@
 import org.apache.poi.xslf.usermodel.XSLFSlideLayout;
 import org.apache.poi.xslf.usermodel.XSLFSlideMaster;
 import org.apache.poi.xslf.usermodel.XSLFTextRun;
+import org.apache.poi.xssf.usermodel.XSSFRow;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.junit.Ignore;
 import org.junit.Test;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTAxDataSource;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTBarChart;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTBarSer;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTChart;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumData;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumDataSource;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTNumVal;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTPlotArea;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTSerTx;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTStrData;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTStrVal;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTTitle;
+import org.openxmlformats.schemas.drawingml.x2006.chart.CTTx;
+import org.openxmlformats.schemas.drawingml.x2006.main.CTTextBody;
+import org.openxmlformats.schemas.drawingml.x2006.main.CTTextParagraph;
 
 
 public class TestXSLFBugs {
@@ -479,6 +506,42 @@
     
         ppt2.close();
     }
+    
+    @Test
+    public void bug59806() throws IOException {
+        String inputPath = "59806.pptx";
+        XMLSlideShow pptx = null;
+        try {
+            XSLFChart chart = bug59806_getChartFromTitle(inputPath);
+            // embedded Excel workbook that holds the chart data
+            POIXMLDocumentPart xlsPart = chart.getRelations().get(0);
+            
+            // updated the embedded workbook with the data
+            // This is where the exception is thrown
+            OutputStream xlsOut = xlsPart.getPackagePart().getOutputStream();
+            
+        } finally {
+            if (pptx != null) pptx.close();
+        }
+    }
+    
+    private static XSLFChart bug59806_getChartFromTitle(String inputPath) throws IOException {
+        InputStream stream = POIDataSamples.getSlideShowInstance().openResourceAsStream(inputPath);
+        XMLSlideShow pptx = new XMLSlideShow(stream);
+        try {
+            XSLFSlide slide = pptx.getSlides().get(0);
+            // find chart in the slide
+            for (POIXMLDocumentPart part : slide.getRelations()) {
+                if (part instanceof XSLFChart) {
+                    return (XSLFChart) part;
+                }
+            }
+            return null;
+        } finally {
+            // This is the source of the Rule M2.4 exception
+            if (pptx != null) pptx.close();
+        }
+    }
 
     @Test
     public void bug58217() throws IOException {
Index: test-data/slideshow/59806.pptx
===================================================================
Cannot display: file marked as a binary type.
svn:mime-type = application/octet-stream
Index: test-data/slideshow/59806.pptx
===================================================================
--- test-data/slideshow/59806.pptx	(revision 0)
+++ test-data/slideshow/59806.pptx	(working copy)

Property changes on: test-data/slideshow/59806.pptx
___________________________________________________________________
Added: svn:mime-type
## -0,0 +1 ##
+application/octet-stream
\ No newline at end of property