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I am curious what the best practice is. For example we have product entity, it has two fields: Price and VAT. What to save in Price value? Base price, and then calculate result price based on base price and VAT code. Or save calculated price and save VAT just for information purposes.
Without VAT, since it can change independently from prices.
Edit: by the way, why are you storing the VAT for each product? Isn’t it better to categorize your products (if you have different types of VAT) instead?