In DHCP if you add a static entry that is included in the lease range of the dhcp server you get an error. Log snipped ...
gatekeeper dhcpd: DHCPDISCOVER from 00:xx:5a:8a:xx:xx via eth1
dhcpd: DHCPOFFER on 192.168.0.50 to 00:xx:5a:8a:7xx:xx via eth1
dhcpd: Dynamic and static leases present for 192.168.0.50.
dhcpd: Remove host declaration REF_koUUIFYFcr or remove 192.168.0.50
The highlighted reference is annoying and the static list should be automatically added to dhcp exception list since there is no way of manually doing it via webadmin.