I'm using an OnActivate Choice to capture an Actor Reference.

What I can't do is then use that ActorReference in the Script I want. I thought I used this code:

MyQuest Property MyQuestScript AutoObjectReference ActivateTargetActivateTarget = akTargetRefMyQuest.MyTarget = ActivateTarget

But that returns an error about "No viable alternative at input property". If I remove "MyQuest Property MyQuestScript Auto" I get told "MyQuest" is not defined, but nothing I do seems to define it... Can anyone help me work this out, please?

Instead of Myquest property MyquestScript Auto, you should use Myquestscript property myquest auto.

But you need to select an instance of myquestproperty. Right now myquest is a void myquestscript property waiting to be filled

I think this is what you are looking for:

Quest Property MyQuest  AutoObjectReference ActivateTargetActivateTarget = akTargetRef(MyQuest as MyQuestScript).MyTarget = ActivateTarget

Thanks for your help I had to do a bit of messing around since it wouldn't accept the Variable/Defines at first, but now it is and it all works