Shipping agents and marine suppliers
A ship chandler might quote in USD, buy locally in AED and receive payment weeks later from an owner in Singapore or Greece. Each invoice needs the right currency, and the FX gain or loss on settlement needs to land in the right account. HelloBooks records the invoice in USD, keeps the AED value at the invoice rate, and posts the difference when the payment arrives.
Services supplied to vessels and to overseas principals can have specific VAT treatment, sometimes zero-rated and sometimes not. HelloBooks lets you set the treatment per line, but the decision rests with you and your tax agent; the agent will not guess on a marine supply it has not seen before and flags it for review.