ISO 17021-1, clause 8.2.2 The certification body shall provide by any means it chooses certification documents to the certified client
i) in the event of issuing any revised certification documents, a means to distinguish the revised documents from any prior obsolete documents.
Can this requirement be considered as fulfilled if the revised certification document has a unique serial number/date different from the obsolete document or shall the revised document have a reference to the obsolete document
September 2017
Both cases can be acceptable.
The CB can use any means to distinguish or differentiate these two versions of the obsolete document.