DGN2200v3 Inbound Firewall Rules

Hi, I've just replaced a DGN2000 with a DGN2200v3 ADSL modem router.

I'm trying to replicate my firewall rules from the 2000 but I'm having problems.

On the old router I could add multiple rules with the same service/port. This allowed me to allow different WAN IP ranges (ie: allow range A-B, allow range C-D, allow IP address E, etc).

I can't do this on the DGN2200v3 as when I try to add the second rule it says the service is already in use.

How can I setup the inbound firewall to allow multiple WAN IP ranges access to the same port?

Thanks.