If a document filed in a proceeding has been served and is later amended, the party making the amendment must, as soon as practicable, serve on the parties on whom the document was served a copy of—
(a) if the amendment is made under section 64 (Simple amendment)—a notice stating the amendment and the matters mentioned in section 64 (2); or
(b) if the amendment is made under section 65—the fresh document filed.