I encounter a problem with PSI when 2 users are performing operations at the
same time.

User A is updating the project (CheckOutProject - wait - QueueUpdateProject
- wait - QueueCheckInProject).

At the same time on an other machine, User B is reading parts of the project
with ReadProjectEntities. ReadProjectEntities fails with error
ProjectHasWriteLock...

Any idea why this happen? Why a project write lock should prevent a read???