Increase 1 attribute Decrease another

In my map I have an item that I want to increase strength by 20 and reduce intelligence by 10. Does anyone know how this could be done?

Thx

Attribute bonus:
Strength bonus: 20
Intelligence: -10
-.-'

You cant do that. I tried it with 'allow negative real values in the object editor' turned on but it still did not work.

Did you try holding shift and then press enter? That usually works. If not, trigger it?

Wow.

Clicking shift then enter worked!

Thanks a bundle

You clicked allow negative reals in the object editor, attributes are integers.
Shift-clicking allows any value to be negative in the object editor.

Sure it works in game? Used to be no way in game for an ability to reduce a hero stat, without triggers.

Yes it works in game.