COPQ Formula-Determining Lost Revenue

Hello,

My Green Belt project is to improve our unit forecast accuracy X%.  I am trying to determine how much additional revenue can be generated if the accuracy is 15%, 25%, etc.   Forecast accuracy equals how close we are to predicting a customer's purchase order quantity.  Has anyone ever done this type of project or has an knowledge as to how I can set up my COPQ to gauge how an increase in forecast accuracy will  increase revenue?  15% accuracy = $100k, 25% accuracy = $175k, etc????  Please help!!!!  Thank you all.