Hello Guruguga
Working as a ticket inspector, I can surely tell you where to find that information: in the Saver ticket tariff. It is in German only, you can find it in the attached document at paragraph: 2.1.5
The tariff states (translated):
If a customer has purchased a supersaver ticket with a Half-Fare travelcard, although they do not have a travelcard, an additional half-price ticket at the standard fare is required; without a second ticket, they are deemed to be a passenger with a partially valid ticket in accordance with tariff 600.
→ A passenger with partially valid ticket means, you will have to pay in the train a surcharge of CHF 70 plus a normal half fare ticket.
Best regards,
Roland
All tariffs are available here: https://www.allianceswisspass.ch/de/tarife-vorschriften/uebersicht