How to update the additional information of invoice lines for a processed invoice in Fusion?

Summary:

We have an external Appian application from where few transactions(Invoice & Credit Memo) are raised and interfaced to Oracle Fusion (AR Module) via Rest API using mulesoft application.

In that few details were missing in invoice line details at fusion due to mapping issue while sending from appian.

The issue has been fixed now and all the details are being sent to Fusion.

But there are few transactions already got created in Fusion with missing details and are processed to customers.

Hence we couldnt update the details from Fusion front end as the invoice is complete and processed(Closed).