SSLVPN how to exclusively filter Client access per single IP and usergroup on 5.6

I am looking for this option in the cli in the version 5.6.2. I can't find it. I tried to restrict the access in the firewall policy to one specific source ip address, but it doesn' twork.

config vpn ssl settings        config authentication-rule             edit 1                 set source-interface "port1"                 set source-address "Pub_Source_IP_1"                 set groups "ssl-vpnGroup1"                 set portal "full-access-1"             next             edit 2                 set source-interface "port1"                 set source-address "Pub_Source_IP_2"                 set groups "ssl-vpnGroup2"                 set portal "full-access-2"             next         end end

http://kb.fortinet.com/kb/documentLink.do?externalID=FD38710

Thanks and kind regards, Judit