Can't overwrite existing route in Route info menu

Create a route in the 'Route info' menu.  Select 'Save as' from the options list.  Message box comes up asking to enter new routing points set name with 'New set' as default name.  Enter name '04-16' and click 'OK'.  It is now in the route listing under 'My places'.  In 'Route info' menu, add a waypoint and then select 'Save as' from the options list.  Give the new file the same name, '04-16' and click 'OK'.  Message box appears saying 'name already exists, do you want to save anyway?'  Click 'YES'.  Message box comes up asking to enter new routing points set name with 'New set' as default name - same message box as when saving the route the first time.  Modified file is not been saved in the 'My places' route list.