New Rates & Invoicing Application

Rachel, Jo and Kevin,
We have been collecting requirements for a new Rates, Allocations and Invoicing System and have some preliminary estimates to develop a new system for all 3 pipes. There are significant savings on the IT side by replacing the 3 separate systems with a new application. However, the IT savings are not enough to justify the entire project. I know that you all have needs on the business side to address negotiated rates and discounts along with automation of invoicing where these rates are used. I know that there is a lot of manual efforts with the existing systems, but I need your input as to whether you would have business savings, efficiencies, etc.. with replacing these applications. Could you all provide some business justification for such a project? If so, what would the savings and/or efficiencies be? Could you quantify? Please let me know your thoughts. Thanks.