[SOLVED] Problem building auto action to deselect multicheckbox field

I have two fields.
One is controlled by management, to determine who is allowed to receive SMS's (checkbox).
The other is controlled by the user, which defines what kind of SMS's they want to receive (multicheckbox).
If management removes the 'allowed to receive sms's' (cb_smsaktiv), I would like the to clear the multicheckbox, so I constructed an auto-action like this:



In my head, this checks for changes of the cb_smsaktiv, then checks if it has been set to 0, and then it sets the multiselect field to empty.
But it doesn't work, so what have I done wrong?

Your second conditional isn't a valid substitution. You need to surround it with brackets. So it should be [cb_smsaktiv] for example.

Ahh, of course, I've been staring me blind on this
Thank you very much