Sorry if it's a dumm question, new to BAEC.

I'm trying to book LIM-CUZ (Cusco) with avios on LAN. It used to be possible just a few weeks back. Now the site wants me to choose between Chico, USA and Chios, Greece when I put CUZ into the search engine.

Can I somehow force ba.com to book it or do I have to call in? Thanks!