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
/**
	 * other container, has none group. 
	 */
	public static final String TYPE_GROUP_NONE = "none";
	
	/**
	 * Return the group container type of the given element handle.
	 * 
	 * @param handle
	 *            the handle of the element.
	 * @return the group container type of the given element.
	 */
	public static String getGroupControlType(DesignElementHandle handle){
		if ( handle instanceof ListingHandle )
		{
			return TYPE_GROUP_LISTING;
		}
		DesignElementHandle result = handle.getContainer( );
		if ( result != null )
		{
			if ( result instanceof GroupHandle )
			{
				return TYPE_GROUP_GROUP;
			}
			return getGroupControlType( result );
		}
		return TYPE_GROUP_NONE;
	}
}