Should not be able to change the interface on an associated firewall rule
Associated firewall rules should not be able to have their interface changed on firewall_rules_edit, as that's the responsibility of the NAT side.
#5 Updated by Erik Fonnesbeck over 9 years ago
It does appear so in the code for the port forward edit page.
There may be a bit more to this than simply disabling the boxes for changing the settings. There was when I fixed saving when the source address was now disabled on associated rules. Looking into it right now.