Random concurrency error?

[coni2k]

Once in a while, there is a concurrency error.
Find him and destroy him!

[coni2k]

This was happening when there is new user level entity being created on client-side.
Since UserId was not set, it was creating the entity with value 0 on client-side. After inserting the record on server-side, it's sending the entity back to client with it's proper UserId. breeze thinks this is a new entity and creates a new one, since it can't match Ids and it was failing for the next operations.

Now while creating the new entities, it also sets UserId, which solves the issue.