How to delete a current flightplan in CDU?

Hello,

I've entered a flight plan (before performance data) and saved it as a company route. Now I'd like to clear FMC from the current flight plan and enter my saved company route instead. I'm trying to delete the destination (to clear the current flight plan) but FMC says it's an INVALID DELETE. What is the right way to do that?

Thanks,

Igor Petrov.