511Amendment—service of amended or revised document

511 Amendment—service of amended or revised document etc If a document has been served and is later amended, the party making the amendment must serve on each other active party— (a) if the amendment is made on the document under rule 509 (2)— a copy of the document as amended and the notice mentioned in rule 509 (2) (b); or (b) if a revised document is filed under rule 509 (4)—a copy of the revised document and the notice mentioned in rule 509 (4) (b).