Historical average purchase prices from tax tranches

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From the tax-related average purchase prices (tax tranches), a commercial, historical average purchase price can be calculated for the delivery to which they relate.

In doing so, the historical price is calculated as the weighted average value of the prices from the tranches weighted with the nominal value. The historical exchange rates and the historical interim profit are also determined.

The historical exchange rate is provided, because the tax tranches are always in the tax currency and have no connection to the account.

The date of the last tranche delivery is used as the historical date.

As no price is delivered for tax tranches before flat tax, all tranches before this date are summarised in one single tranche with the price 0. To obtain an approximately good price, the valuation price of the class on this date is provided for this tranche. During import, the price is taken that is set in the interface; custom rules are ignored.

Note that this is a technically imprecise (incorrect) calculation, because commercial (average prices) and tax (FIFO) aspects are mixed.