Adding per user cals in 2012 - get message "Ensure the licensing mode is set to Per Device"

Hi,

I'm trying to install some per user RDS cals onto our 2012 license server, but when I select per user as the license type I get a warning "Ensure that the licensing mode is set to Per Device".

Is this a known issue/bug? Can I proceed anyway to install the per user cals?



Thanks

Steve