Bug 167545 Copy a cascading parameter group and paste it to another parameter group causes an exception thrown
Steps to reproduce: 1.Copy a cascading parameter group using short cut key "Ctrl+x"/"Ctrl+c", or choosing context menu "Cut"/"Copy"; 2.Paste it to another parameter group using short cut key "Ctrl+v", or choosing context menu "Paste"; Expected result: The source one is pasted in the destination. Actual result: An exception thrown org.eclipse.birt.report.model.api.command.ContentException: The Cascading Parameter Group("Source") is not allowed in the slot (parameters) of Parameter Group("Destination").
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
* 
	 * @return the meta data dictionary
	 */
	public static IMetaDataDictionary getMetaDataDictionary( )
	{
		return designEngine.getMetaData( );
	}
	public static String convertToXMLString( Date date )
	{
		if ( date == null )
		{
			return null;
		}
		GregorianCalendar cal = new GregorianCalendar( );
		cal.setTime( date );
		String pattern = XMLDATE_PATTERN_FULL;
		if ( !cal.isSet( Calendar.HOUR ) )
		{
			pattern = XMLDATE_PATTERN_DATE_ONLY;
		}
		else if ( !cal.isSet( Calendar.SECOND ) )
		{
			pattern = XMLDATE_PATTERN_WITH_OUT_SECOND;
		}
		else if ( !cal.isSet( Calendar.MILLISECOND ) )
		{
			pattern = XMLDATE_PATTERN_WITH_OUT_MILLISECOND;
		}
		DateFormatter formater = new DateFormatter( pattern );
		return formater.format( date );