How Can I Blocking Connection from My Interfaces ?

Hello,

i have Fortigate 80c.

internal1 - my lan network

wan2 -this is my wifi (connect to access point)

i want to create rule that Blocking any connection  From wan2 (wifi)  to internal1 (my lan)

i tried: incoming interface (wan2) >source (all) > outgoing interface (internal1) > Destination (all) Deny

and it is now working.

Where i was wrong ?

Please see my inteface on attached File.