How to remove "ignored for sync"

Ages ago I guess I met this ‘feature’ but now there is one item in Scrivener, which will not sync due to this message:
image

I feel kind of goofy to ask this, but I have not found anything in the Help

GreyT

Under this message in the inspector you should also see the heading “Linked Items”, under which it will list “Scrivener” and “Timeline”. Next to “Timeline” it will say “Ignore” and next to that there should be a “Change” button you can press. If you click this button, it will give you options to sync this document instead of ignoring it. Choose which option you would like to do (eg. Create a new event)