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
*            GroupHandle
	 * @param column
	 *            the column to add
	 * @param inForce
	 *            true to add the column with duplicated expression,or false not
	 *            to do
	 * 
	 * @return the handle of the binding column,or null if failed
	 */
	public static ComputedColumnHandle addColumn( DesignElementHandle handle,
			ComputedColumn column, boolean inForce ) throws SemanticException
	{
		Assert.isLegal( handle instanceof ReportItemHandle
				|| handle instanceof GroupHandle );
		if ( handle instanceof GroupHandle )
		{
			return ( (GroupHandle) handle ).addColumnBinding( column, inForce );
		}
		return ( (ReportItemHandle) handle ).addColumnBinding( column, inForce );
	}
	/**
	 * Returns the binding column iterator of the given element
	 * 
	 * @param handle
	 *            the handle of the element. It should be a ReportItemHandle or
	 *            a GroupHandle,or an empty iterator will be returned.
	 * @return the iterator of binding columns
	 */
	public static Iterator getBindingColumnIterator( DesignElementHandle handle )
	{