Bug 142462 Cannot create bindings for data set output parameters
Define a JDBC Stored Procedure data set with at least one data set output parameter. Bind this data set to a table. Edit data binding for the table and add a new binding. In the expression builder, under "Available Data Sets", only the columns for the data set are shown as available. The output parameters are not shown. This is a regression against 2.0. This bug makes data set parameters unusable.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/BindingExpressionProvider.java
dataSetHandle = DEUtil.getFirstDataSet( handle );
		}
		else if ( handle instanceof GroupHandle )
		{
			dataSetHandle = ( (ReportItemHandle) ( (GroupHandle) handle ).getContainer( ) ).getDataSet( );
		}
	}
	protected List getCategoryList( )
	{
		List categoryList = super.getCategoryList( );
		if ( dataSetHandle != null )
		{
			categoryList.add( DATASETS );
		}
		return categoryList;
	}
	protected List getChildrenList( Object parent )
	{
		if ( DATASETS.equals( parent ) )
		{
			List dataSeList = new ArrayList( );
			dataSeList.add( dataSetHandle );
			return dataSeList;
		}
		if ( parent instanceof DataSetHandle )
		{
			try
			{
				return DataUtil.getColumnList( (DataSetHandle) parent );
			}