We now have the ability to Edit/Modify the notes on the Invoice.

Once a payment invoice is created you will be able to Edit/Modify it. You may access this by going to Billing at the Left Menu then navigate to the Activity Summary and it can also be found in the Transactions. Then choose the customer you'd like to write a note on.

Go to the Billing Activity Summary.

Scroll down to the Invoice and click on "Edit", write your notes and then click on "Confirm" once done.