It seems to me that this action is not working.
I wasted on it half day, to no avail.
Initially I thought that it couldn't find the GameObject, because it's nested and not on the root.
So I changed, got the Parent and then the Child.
Still nothing.
It looks like the action is stuck in getting the variables from OWNER, which is something I don't need. I need to get the variable from another object.
But despite the other object being found, stored and selected, it looks like the action still pulls the data from the Owner.