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
assertTrue( e instanceof PropertyValueException );
		}
		labelHandle.setHeight( "5in" ); 
		assertEquals( "5in", labelHandle.getHeight( ).getStringValue( ) ); 
		labelHandle.setX( ".5in" ); 
		assertEquals( "0.5in", labelHandle.getX( ).getStringValue( ) ); 
		labelHandle.setY( "5.38in" ); 
		assertEquals( "5.38in", labelHandle.getY( ).getStringValue( ) ); 
	}
	/**
	 * Tests the undo operation for invalid style name.
	 * 
	 * @throws Exception
	 *             if any exception
	 */
	public void testUndoInvalidStyle( ) throws Exception
	{
		TextItemHandle textHandle = (TextItemHandle) designHandle
				.findElement( "myText" ); 
		textHandle.setStyleName( "My Style" ); 
		designHandle.getCommandStack( ).undo( );
		assertEquals( "unknownStyle", textHandle 
				.getStringProperty( ReportItem.STYLE_PROP ) );
		assertEquals( null, textHandle
				.getElementProperty( ReportItem.STYLE_PROP ) );
		assertEquals( null, textHandle.getStyle( ) );
	}
	/**
	 * Tests the undo operation for invalid DataSet name.
	 *