[AlphaCommerceHub] Can an `OrderDetails` → `ItemAmount` be negative?

Extensions AlphaCommerceHub
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1

The documentation says nothing about it.
developer.alphacommercehub.com.au/docs/alphahpp-#product-line-information

A negative order item can be used to express an order-wide discount.
It is discount for an order at the whole, not for a particular product ordered.

2

It looks so. But I need a confirmation, that it is a feature, not a bug:

46 * 2 + 57 + 13 - 1 = 161

3

I have got a response from AlphaCommerceHub (in exactly 3 weeks):

Yes confirming this is a feature to allow discounts etc to be applied to an invoice