Synchronization Editor message "Possible Conflict - The synchronization project is currently being edited by another user" (4209279)

The Synchronization Editor is displaying the following message:

"Possible Conflict - The synchronization project is currently being edited by another user."

However, there are no other users editing the project. How can this message be resolved?

Active connections can be disconnected in the database.

First find the relevant Synchronization Project in the database with this query:

select Displayname, editedby, editedsince, * from dprshell

The Displayname field can be used to identify the specific project that is throwing this warning. Then, if you are certain there are no active users who would be disconnected, you can end any active connections with this SQL query:

update dprshell set editedby = null, editedsince = null where UID_DPRShell = '<UID of your project>'