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
{
	public static final String DATASETS = Messages.getString( "ExpressionProvider.Category.DataSets" ); 
	private DataSetHandle dataSetHandle = null;
	public BindingExpressionProvider( DesignElementHandle handle )
	{
		super( handle );
		if ( handle instanceof ReportItemHandle )
		{