Bug 163271 Cascading parameter dialog - Changing from multiple to single dataset does not work
Steps to reproduce - - Create a new cascading parameter group - Select multiple dataset - define parameter country and associate it with datasetCountry - define parameter state and associate with datasetSate Now try to change from multiple dataset to single dataset. The second dataset still shows up and also the report design file is wrong. The single dataset should be saved ast he cascading parameter group level.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/GetParameterDefinitionTask.java
implements
			IGetParameterDefinitionTask
{
	private static final String VALUE_PREFIX = "__VALUE__";
	private static final String LABEL_PREFIX = "__LABEL__";
	
	
	
	
	protected Collection parameterDefns = null;
	protected HashMap dataCache = null;
	private List labelColumnBindingNames = null;
	/**
	 * @param engine
	 *            reference to the report engine
	 * @param runnable
	 *            the runnable report design
	 */
	public GetParameterDefinitionTask( IReportEngine engine,
			IReportRunnable runnable )
	{
		super( engine, runnable );
	}
	/*