[Bugfix] Incorrect Unit Net Price #432
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…d ensure compatibility with tax calculators. Updated tests and added fallback for cases without a calculator.
UnitNetPriceProvider to handle taxes included in prices an…
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Description
When no CalculatorInterface is injected (the deprecated path),
UnitNetPriceProvidernow recalculates the included tax from the full unit price (unitPrice − unitPrice/(1+rate)) instead ofsubtracting the neutral adjustment's getAmount(). That old amount is computed on the discounted, post-promotion price, so subtracting it from the full unit price produced a net price that diverged
from the actual one (e.g. 10740 instead of 10000 on a €120 item with 20% included tax and a 37% discount).