the expression is properly evaluated and functional without the parentheses.

it is a display issue in the WYSIWYG editor,
where the formula is too long to fit in the field and wrapped after the minus 
sign.

i.e.

-Form.aaaa.aaaaa.aaaaaa

becomes

-
Form.aaaa.aaaaa.aaaaaa

you can confirm by extending the height.
parentheses won't solve it.

by contrast, this does't wrap:

Form.aaaa.aaaaa.aaaaaa*-1

2 - try: -(Form.lastQ.outputVAT) or (-1 * Form.lastQ.outputVAT)



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