If I remember correctly, you must create a new behavior which adds a value to a specific attribute and can stack. Then add (or remove) that new behavior to the unit. Adding a veterancy attribute behavior won't work.
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Demtrod Regular ShmoeHow do I increase the amount for an attribute behavior (the same way as it's done with a veterancy behavior) with a trigger?.
I tried using the:
But it does not increase the amount, it just tries to add the behavior to the unit, which it already got.
Gridlock TD : Elements