Can you add a project number to a contract event after it's been billed?

Summary:

We've identified that we should have included the project number when creating an event for a contract to allow us to report through Fusion Data Intelligence (FDI). We're trying to understand if there is a function that front end users do not have that allows others to add the project number behind the scenes.

Content (please ensure you mask any confidential information):

The event has been billed and revenue recognized. Currently there is no option to edit the contract event. It's important for us to have the project number so we can utilize FDI to reflect revenue associated with the project. If others have ideas on how to incorporate information about event based revenue when no project number was referenced, we'd be open to learning more.