Amount excluding VAT higher than including VAT due to discount

Do you happen to have an answer/solution for here? I have the same question and I can't find the answer back. Thank you :)

I just received an answer from an accountant that we should fill in the original amounts, as the vAT is calculated on the original amount (which I also see on my invoice). This vAT is then added to the reduced price. So enter the original amounts so that the vAT is correct and enter the discount separately in a separate line as a negative cost so that the costs are also correct.