enhancement
major
minor
major
minor
defect
If the object stored in a reference-type attribute is deleted, subsequent accesses to that attribute should return the value null. However, if the reference is marked with the "veto" deletion policy, the access will fail with an exception. Since the deletion policy is not enforced until commit, access attempts made after the (still transient) deletion of the object and the (failed) commit must normally return null —as if the deletion had been successful.
Test
No test; too time-consuming.