How to delete a co route ?

[Guest]

If I want to delete a Co Route the FMC outputs an invalid delete , same speech if I try to delete the from and the to. I can only delete the parts of the route. How can I get rid of a route ? I would like a kind of reset of the FMC without touching its setup like the various options etc.. Thx

[Guest]

While flying if I do a mistake and I input a coroute how can I delete it while flying ? I think this error in the reality, even if it is a rare one , it may happens. BTW, also deleting the .rte file the couroute is automatically loaded into the FMC once the game starts.....