Link & Reference Integrity Check

The "Potential link breakage" error will appear when you attempt to delete something which is being linked to from somewhere else within your site.

If you attempt to delete an item (such as a page) that is being linked to from somewhere elsewhere in your site, you will get a “Potential link breakage” warning.  The error will show you a list of all pages that link to the item you are trying to delete.  This automatic safety measure is useful in determining just how important a particular asset is to your site.  When prompted, you are given the option to delete the item anyway (not recommended), or cancel the action.