Ho to make item Damage +1 give -1

Hi guys, I am trying to make a AttackMod lib which will change the attack of a unit. I have a problem, I can't make Item Bonus Damage give -1 attack bonus but I know it is possible.
My stupid WE just blocks it... how do I do it?

did you use shift? by the way, check out UnitProperties by Litany. no need to reinvent the wheel here, especially in this case, you'll see why.

I used shift ... And I am also aware of UP. The reason why I am making this small modular system is because I don't like UP ...
Although it will only be able to give +/- 498 attack bonus it will be very easy to implement and it won't need 1000 ability to do that, just 1.

Ticked allow negatives in preferences?

This.

What makes me feel pathetic is that I have that box checked !

This makes me conclude that, there is either something messed up in my WE; or that I don't know how to use the shift trick !

Hold shift and double click the indicated field, then insert a negative number?

Ahhh ... I knew I was messing something up ... God bless you for destroying my moments of stupidity with straight answers xD
I am going to bookmark this page =P

great this problem was also solved. I don't really know what else to say, I really don't know...

Not enough modular for me.

Shit happens sometimes xD

I'm working with map of some guy, and UP causes name clashes with tons of globals/locals; this is because Life, Mana, MaxLife, MaxMana is quite common variable names depending on the coder's style, making UP not a viable option for this map. Also it is ridiculous to make sure calling something like CreateUnitProperties if all you need to do is just simple max state modifications; that's why I wrote MaxState (name is subject to changes).

Where is the neg rep button? :p