When and how is the association initially set?
Since it is a association and not inheritance, the object life cycle is separated. Committing the Carlog.User != committing the Administration.Account. So when both objects are new, both must be committed separately.
Or happened this after you changed your model from inheritance to association. If you haven't created a conversion, then the part carlog.user and Administration.account are separated as individual tables and the 1-1 association isn't populated automatically.