Surf SOHO fw 8.0: Schedule for WAN vs AP>SSID

What is the difference between the WAN schedule and the AP>SSIDs schedule?
In order to access the router via InControl2, I need to keep the Operating Schedule “Always On” under WAN Connections . However, I would like to use a “Nightly Schedule” for the SSID under AP>SSID.

If I have the Operating Schedule “Always On”, then the “Nightly Schedule” for the SSID fails.

What am I missing?