Adjusting Revenue

Is there a way to adjust goals that were already set and recorded by Piwik. For example, I have 4 goals reached. my actual revenue is $100 but the way I set my goals in Piwik based on the average, it’s shows $50, thus under-reporting revenue per visit. Is there a way I could enter each goal’s actual value, so Piwik will give me the right “Revenue per visit”