A regular with no substitute on file broke her wrist and will be out for (minimum) 6 weeks.I'm next in seniority to hold a route down. I requested that I be placed on the route.We've got a new supervisor who is being advised by the former supervisor.New supervisor is telling me I can't have the route because the subs below me can't carry big routes and that they need me to do them. If I take this hold down, they'll have to split routes I normally carry by myself between multiple RCAs.Of course I tell the supervisor that I understand and feel for them but that situation doesn't affect me. It's not my job to carry the big routes so the other newer subs can take it easy and carry little routes. I'm concerned that I won't be treated fairly in this situation.Is there anything I can do? Should I grieve?