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
* Returns the integer font size for string value.
	 * 
	 * @param fontSize
	 * @return
	 */
	public static int getFontSize( String fontSize )
	{
		if ( DesignChoiceConstants.FONT_SIZE_LARGER.equals( fontSize ) )
		{
			fontSize = DesignChoiceConstants.FONT_SIZE_LARGE;
		}
		else if ( DesignChoiceConstants.FONT_SIZE_SMALLER.equals( fontSize ) )
		{
			fontSize = DesignChoiceConstants.FONT_SIZE_SMALL;
		}
		else if ( fontSize == null )
		{
			fontSize = DesignChoiceConstants.FONT_SIZE_MEDIUM;
		}
		String rt = (String) DesignerConstants.fontMap.get( fontSize );
		if ( rt != null )
		{
			return Integer.parseInt( rt );
		}
		String[] sp = DEUtil.splitString( fontSize );
		if ( sp[0] != null && DEUtil.isValidNumber( sp[0] ) )
		{
			return (int) CSSUtil.convertToPoint( new DimensionValue( Double.parseDouble( sp[0] ),
					sp[1] ) );
		}