Item sales invoice why cant I add the discount field in $, only the % discount

I have an important client who is considering moving away from MYOB because their B2B reseller customers demand that their invoices include the Net unit price per unit after applying the discount. They want to with ease check against the my clients contract with them on RRP price, the discount % and value and the resulting net Unit price. A simple sum of RRP - discount.

The issue is they manually have to compute, especially because prices and discounts are fluid and change for a lot of reasons. Its not an unreasonable request to be in a position where the reseller can compare the pricing, discount and net unit price against them clients contract with them

Can I please request a field with the $ value of the discount and for the Unit price i.e RRP minus $value of computed discount.