The DSS should record events and their sequences in their right order. If a person is registered as return in-migrant (IN-MIGRATION), the preceding end event type should be OUT- MIGRATION. If an EXIT is recorded for a person, the immediate next start event type should be ENTRY. If DEATH is recorded as end event type, no subsequent event should be recorded for the deceased person.  Again, routines can check for errors (e.g. a death can not occur to a member prior to the members birth date).  (Stata Routine for Check Sequence of Events.do)