Bug 168026 Still use the existing data binding even though the aggregate is different
I had a table in which a data binding which aggregates on a group. When I insert a new data item in the report, although the expressions are same, it aggregates on All, then it refered to the existing data binding. The expected behavior would be a new data binding is created with different aggregates.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/api/ReportItemHandleTest.java
{
	DesignElement element;
	InnerReportItemHandle innerHandle;
	/*
	 * (non-Javadoc)
	 * 
	 * @see junit.framework.TestCase#setUp()
	 */
	protected void setUp( ) throws Exception
	{
		super.setUp( );
		openDesign( "ReportItemHandleTest.xml" );  
	}
	/**
	 * 
	 */
	class InnerReportItemHandle extends ReportItemHandle
	{
		InnerReportItemHandle( ReportDesign design, DesignElement element )
		{
			super( design, element );
		}
	}
	/**
	 * test getDataSet().
	 * <p>
	 * Test Cases:
	 * 
	 * <ul>