Does anyone know for sure what fare classes GPU and RPU upgrades clear into? Lately the system seems completely broken.

I am on a flight tomorrow night from IAH to FRA and my GPU has not cleared. The flight is R9 and is wide open in business first. I called and got into a big argument with a supervisor who said she can't manually clear GPUs and the system needs to do it.

On another flight from BOS to DEN in a couple of weeks I used a RPU and thought it would clear since the flight is PN8 (it is R0). They said that RPU only clears into R.