Sticky links
When you add a regular link to a page or a post, WordPress saves the URL of that page as the link. This means, if the URL changes, the link is broken.
WordPress makes it all too easy to change page addresses, causing all incoming links to go broke (404 error). Here are a few ways to do that:
- Change the page’s parent
- Change the slug
- Change the site’s permlink structure
WPML prevents changes in URLs from breaking incoming links. When you create a link, WPML automatically makes it Sticky. Instead of storing the URL of that page (at the time the link was created), it stores the page number. This can never change, no matter what you do.
Then, when the page is displayed, WPML inserts the permlink of the page you’re linking to. Whenever the URL changes all pages linking to it update immediately and will link to the correct address.
This screen shot shows how internal links look like in the database, once Sticky links are enabled:

Links turned Sticky by WPML
Your users will never see these “strange” links. Instead, WPML will replace them with the current permlinks when displaying the pages.
Sticky links controls
to enable Sticky links, go to WPML->Sticky links.
Select ‘Enable sticky links‘. Once enabled, WPML will let you batch replace all regular links to sticky links. It will also report any existing broken links and help fix them.
You can always revert this operation by clicking on ‘Revert sticky links to permalinks‘
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