ipmacbinding not working in wireless network

Hi, i have a fortigate firewall(v5.2.3,build670), and i create two interface in this firewall.

one interface is wired network, connect to switch and pc.

another interface is wireless network, connect to fortiap(FortiAP-221C v5.2,build0240,150507).

i want to enable ipmacbinding in wired network and wireless network. this is my configuration in fortigate firewall.

############ config #############

config firewall ipmacbinding setting     set bindthroughfw enable     set bindtofw disable     set undefinedhost block end

config firewall ipmacbinding table     edit 1         set ip <ip address>         set mac <mac address>         set name <name>         set status enable     next end config system interface

    edit WiredNetwork

        set ipmac enable

end

config system interface

    edit WirelessNetwork

        set ipmac enable

end

######### end ########

this configuration working fine in wired network, but it's not working in wireless network.

any undefined wireless equipment can connect to internet through fortigate firewall.

please help me, thanks a lot.