InDesign versions 14, 15, & 16

An endnote should be locked for editing if its parent story is checked out.

Currently, endnotes can be edited in InDesign even if the parent story is locked (if it's being edited in InCopy, for example). This can create a situation where content can be lost without any warning. When the link is updated in InDesign, InCopy's endnotes "win" and overwrite any changes that were made in InDesign (see attached 1_conflict.png).

Worse, an endnote can be removed while its parent story is checked out. The endnote marker is removed even though the parent story is locked. Updating the link will then actually provide a "changes will be lost" alert, but only because removing the endnote modified the locked(!) parent story.