If a series is removed from a scatter chart, the workbook is corrupted.  When Excel 2011 for Mac or Excel 2010 opens the workbook, Excel reports that the workbook is damaged.  I am using POI version 4.0.1

This has been seen both in charts added to a workbook, and charts that are already in existing workbooks.

The code below adds a sheet to a workbook, adds a scatter chart to the sheet, and adds two data series to the chart.  If nMaxSeries is set to 2 or more, the series are not removed from the chart, and the workbook is not corrupted.  If nMaxSeries is set to less than 2, at least one series is removed from the chart and the workbook is corrupted.

	/**
	 * This method creates a scatter chart in workbook, and adds two data
	 * series. If either scatter series is removed, the chart is damaged.
	 *
	 * @param dstWorkbook
	 */
	private static void removeChartSeriesTest(XSSFWorkbook dstWorkbook) {
		final String procName = "removeChartSeriesTest";
		final int nMaxSeries = 1;
		final XSSFSheet sheet = dstWorkbook.createSheet("Remove series test");
		final XSSFDrawing xssfDrawing = sheet.createDrawingPatriarch();
		final XSSFClientAnchor anchor = xssfDrawing.createAnchor(0, 0, 0, 0, 1, 5, 20, 20);
		final XDDFChart chart = xssfDrawing.createChart(anchor);
		final XDDFValueAxis bottomAxis = chart.createValueAxis(AxisPosition.BOTTOM);
		final XDDFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);

		// Initialize data data sources

		final Double dX[] = new Double[5];
		final Double dY1[] = new Double[5];
		final Double dY2[] = new Double[5];

		for (int n = 0; n < 5; ++n) {
			dX[n] = (double) n;
			dY1[n] = 2.0 * n;
			dY2[n] = (double) (n * n);

		}

		final XDDFNumericalDataSource<Double> xData = XDDFDataSourcesFactory.fromArray(dX, null);
		final XDDFNumericalDataSource<Double> yData1 = XDDFDataSourcesFactory.fromArray(dY1, null);
		final XDDFNumericalDataSource<Double> yData2 = XDDFDataSourcesFactory.fromArray(dY2, null);

		// Creat the chartdata

		final XDDFScatterChartData chartData = (XDDFScatterChartData) chart.createData(ChartTypes.SCATTER, bottomAxis,
				leftAxis);

		// Add the series

		chartData.addSeries(xData, yData1);
		chartData.addSeries(xData, yData2);

		System.out.println(String.format("\r\n%s: chartData.getSeries.size=%d nMaxSheets=%d", procName,
				chartData.getSeries().size(), nMaxSeries));

		// Remove any extra series

		while (chartData.getSeries().size() > nMaxSeries) {
			chartData.getSeries().remove(0);
		}
		System.out.println(String.format("%s: chartData.getSeries.size=%d", procName, chartData.getSeries().size()));

		// Finish up
		chart.plot(chartData);
		final int nSheet = dstWorkbook.getSheetIndex(sheet);
		dstWorkbook.setSelectedTab(nSheet);
		dstWorkbook.setActiveSheet(nSheet);
		dstWorkbook.setFirstVisibleTab(nSheet);

	}