Currently, there's only an ‘Invoice totals tolerance percentage’ parameter option in the D365FO Accounts Payable - Invoice Matching parameters.

But since AX 2012, a lot of customers have been looking for an ‘Invoice totals tolerance amount’ option in addition to ‘Invoice totals tolerance percentage’ option.
Due to its unavailability, most of those customers have had to create their own customization to support the business requirement.

Thus, it would be good to have that option in D365FO.