If you are working with Sandboxes, problems can arise if different users synchronize with the same surrogate module from different sandboxes.

For example, if User A creates an item in their sandbox and then synchronizes with a DOORS surrogate module, and then User B synchronizes with the same DOORS surrogate module from their sandbox; the surrogate object created for the model item may be deleted from the surrogate module when User B synchronizes, because that model item is not present in User B's model.

If you are working with Sandboxes, you should consider only performing synchronizations from trunk versions of the model.