From Mange events page completion date non editable after invoice was cancelled

Summary:

Completion Date not updatable after invoice cancelled.

Content (required):

Create Events for contract C1 and Contract line :1

Generate invoice send to AR

Now cancel the invoice

From Manage Events page try to change the completion date as user entered incorrectly, they want to correct the completion date

Version (include the version you are using, if applicable):

23c

Code Snippet (add any code snippets that support your topic, if applicable):