Someone has misinterpreted what that column is. If you do a Search with M_ACTOR_N_LAD, you’ll see past discussions, such as this one. It’s the last time the userid had an action done on it, such as an instantiation, a password change, those sorts of things. That is, it logs the date of the last modification of the BO account made in Supervisor.
Anita Craig 
(BOB member since 2002-06-17)