Description of problem:
The project editor still has that 'last save wins' behaviour. When two user change something in the Project editor, the second save overwrites the first without any warning or notification.

In one out of many attempts, I got some error pop-up (upon saving) with the option to Reopen or Cancel, but choosing Reopen did nothing with the Project editor. I haven't been able to get this pop-up ever since.

Version-Release number of selected component (if applicable):
BPMS 6.0 ER7

Steps to Reproduce:
1. Users u1 and u2 both open the Project editor for the same project.
2. User u1 changes the project name, saves.
3. User u2 changes the project description, saves.

Actual results:
The second save is successful, no warning or error, first save is overwritten.

Expected results:
Conflict warning, pop-up informing the second user that the file was changed, offering options to Force save, Reopen or Cancel, as with the other editors.