civiCase, Contributions and activities have no record locking!
- Open 2 windows on the same Case
- Edit the details in both windows - use different data in each
- Save record in both windows
- The later saved record will be the only date recorded
There is no user warning either before or after editing or saving the data.
The same is reproducible for activities and contributions.
This may apply elsewhere.
To my mind this is a fundamental show stopper since it can cause loss of data at any time without warning or notice.