As seen below, where the VAT ratio should be 8% on the receipt of the calculated item, it is higher.
To fix this, open the main group that the receipt is connected to from Main Data>Main Groups, then from the tax settings tab select the correct tax ratio, then save.
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To find out the value of tax ratios; you can view the tax ratios by selecting VAT from the Main Data>Taxes tab.
Return to receipts again to see that the said receipt's VAT ratio of its net price has been fixed.
