Open item management is using the amount in which gives you gain or loss by valuating exchange rate. That means if you have amount in an acccount wih different currency then the local one you need to valiate that. However the tax amount is not your money it is the amount you need to give the authorities thats why you do not need to validate that amount, when the time arrives you need to declare the amount of that account with local currency. Thats why you do not need to use open item management for tax accounts.
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