+= and -= operators

[Pierce]

I don't know if this is more a core bug. I thought i could use the operators everywhere, but it seems they are only for variables not for e.g. members. I realized that a few minutes ago as i tried a

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weapon.hp -= 1;

which doesn't work if it is not

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weapon.hp := weapon.hp - 1;

So my simple question: Are these operators only for script variables?

[MuadDib]

Far as I know, correct. For variable/array etc