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
.getPropertyHandle( IReportItemModel.BOUND_DATA_COLUMNS_PROP );
		ComputedColumn newCol = StructureFactory.createComputedColumn( );
		newCol.setName( null );
		newCol.setExpression( "dataSetRow[\"CUSTOMER\"]" ); 
		
		try
		{
			propertyHandle.replaceItem( col, newCol );
			fail( );
		}
		catch ( SemanticException e )
		{
			assertTrue( e instanceof PropertyValueException );
		}
		
		newCol.setName( "CUSTOMERNUMBER" );
		try
		{
			propertyHandle.replaceItem( col, newCol );
			fail( );
		}
		catch ( SemanticException e )
		{
			assertEquals( PropertyValueException.DESIGN_EXCEPTION_VALUE_EXISTS,
					e.getErrorCode( ) );
		}
		
		newCol.setName( "Number" );
		propertyHandle.replaceItem( col, newCol );
	}