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
if ( handle instanceof GroupHandle )
		{
			return ( (GroupHandle) handle ).columnBindingsIterator( );
		}
		else if ( handle instanceof ReportItemHandle )
		{
			return ( (ReportItemHandle) handle ).columnBindingsIterator( );
		}
		return Collections.EMPTY_LIST.iterator( );
	}
	/**
	 * Return the expression for the given binding column based on the given
	 * element
	 * 
	 * @param baseElement
	 *            the base element
	 * @param column
	 *            the binding column
	 * @return the expression for the column
	 */
	public static String getBindingexpression( DesignElementHandle baseElement,
			ComputedColumnHandle column )
	{
		String exp = IReportElementConstants.BINDING_COLUMN_PREFIX;
		for ( int i = 0; i < getBindingLevel( column.getElementHandle( ),
				baseElement ); i++ )
		{
			exp += IReportElementConstants.OUTER_BINDING_COLUMN_PREFIX;
		}
		exp += "[\"" + DEUtil.escape( column.getName( ) ) + "\"]";