The graphic in PSA about the progress of the billing it is based in the total amount (including taxes, discounts, etc) and the estimate cost is not including taxes or discounts, at the end the project will be billing with the estimated cost and the radial graph is not matching with the total amount.
We are suggesting that the radial views in the Project form (at the end) should be more consistence with the estimated costs that is finally that the customer is going to pay for the project.