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
}
	/**
	 * Get default slot id of give container element
	 * 
	 * @param parent
	 * @return slot id, -1 if not found
	 */
	public static int getDefaultSlotID( Object parent )
	{
		int slotID = -1;
		if ( parent instanceof GraphicMasterPageHandle )
		{
			slotID = GraphicMasterPageHandle.CONTENT_SLOT;
		}
		else if ( parent instanceof ParameterGroupHandle )
		{
			slotID = ParameterGroupHandle.PARAMETERS_SLOT;
		}
		else if ( parent instanceof ReportDesignHandle )
		{
			slotID = ReportDesignHandle.BODY_SLOT;
		}
		else if ( parent instanceof LibraryHandle )
		{
			slotID = ModuleHandle.COMPONENT_SLOT;
		}
		else if ( parent instanceof CellHandle )
		{
			slotID = CellHandle.CONTENT_SLOT;
		}