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
structHandle = (StructureHandle) rules.next( );
		assertNotNull( structHandle );
		memberHandle = structHandle.getMember( HideRule.FORMAT_MEMBER );
		memberHandle.setValue( DesignChoiceConstants.FORMAT_TYPE_REPORTLET );
		memberHandle = structHandle.getMember( HideRule.VALUE_EXPR_MEMBER );
		memberHandle.setValue( "bodyData 2nd rule." ); 
		
		structHandle = (StructureHandle) rules.next( );
		assertNull( structHandle );
	}
	/**
	 * Tests common properties on a report item.
	 * 
	 * 
	 * @throws SemanticException
	 */
	public void testProperties( ) throws SemanticException
	{
		LabelHandle labelHandle = (LabelHandle) designHandle
				.findElement( "bodyLabel" ); 
		labelHandle.setWidth( "15in" ); 
		assertEquals( "15in", labelHandle.getWidth( ).getStringValue( ) ); 
		try
		{
			labelHandle.setWidth( -15 );
			labelHandle.setProperty( StyleHandle.MARGIN_TOP_PROP, "-10pt" ); 
			fail( );
		}
		catch ( SemanticException e )
		{