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RV320 port fowarding to other internal subnets

I recently had to upgrade our border router to an RV320 as the old one couldn't handle the throughput.  

The RV320 is acting just as a border router.  It does simple NAT, most of the functions are not used.

I want to add some port forwards but the internal LAN link is really just a connection to a firewall that connects internally to many subnets.  I put in an advanced route for this but when I try and add port forwards I get the following message:

"Private IP address should be under!"

Now I can fudge this and change the LAN subnet mask, add the port forwards and change the subnet mask back, but this is a real hack.  Is there a way to do this correctly?