[The golfer]

I am currently using Eucon 3.0.1 so can't confirm for 3.1. Try holding the automation soft key first, than select the track.

As an alternative, hold the focus(waves) button while selecting the "no" key on the channel you want to change the automation. Scroll with the fader to choose your automation mode then press the "yes" button to confirm.

Hopes that helps!