How to reproduce :
- Create a page with an article containing a link to an attachment.
- In SiteMap, select this page, and click on "Copy page" button.
- Select "SiteMap" node in SiteMap, and click on "Paste page (contents will be duplicated)" button.
- Open copied page and select article, then click on "Properties".
- Click on link to "JCR identifier" in order to open _repository.
- => Attachment is present twice => KO
=> This leads to an error during data archiving.