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 -1;
	}
	/**
	 * Check if the given element is linked from a library or not.
	 * 
	 * @param handle
	 *            the handle of the element to check
	 * @return true if it is linked from a library ,or false if else;
	 * 
	 */
	public static boolean isLinked( DesignElementHandle handle )
	{
		if ( handle.getExtends( ) != null )
		{
			return handle.getExtends( ).getRoot( ) instanceof LibraryHandle;
		}
		return false;
	}
	/**
	 * Return the group list of the given element.
	 * 
	 * @param handle
	 *            the handle of the element.
	 * @return the group list of the given element.
	 */
	public static List getGroups( DesignElementHandle handle )
	{
		List groupList = new ArrayList( );
		if ( handle instanceof ListingHandle )
		{