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.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
SlotHandle groupSlotHandle = ( (ListingHandle) handle ).getGroups( );
			for ( Iterator iter = groupSlotHandle.iterator( ); iter.hasNext( ); )
			{
				GroupHandle group = (GroupHandle) iter.next( );
				groupList.add( group );
			}
			return groupList;
		}
		DesignElementHandle result = handle.getContainer( );
		if ( result != null )
		{
			if ( result instanceof GroupHandle )
			{
				groupList.add( (GroupHandle) result );
				return groupList;
			}
			return getGroups( result );
		}
		return groupList;
	}
	
	/**
	 * The group container is ListingHandler, list, table, and so on.
	 */
	public static final String TYPE_GROUP_LISTING = "listing";
	
	/**
	 * The group container is GroupHandler
	 */
	public static final String TYPE_GROUP_GROUP = "group";