Field help (AMIACS) 

This access code makes it possible to prohibit access to the current record for some users.

If the field is populated, only users that have this access code with read access rights (and write access rights respectively) can view (or with write access rights, modify) the record.

Execution right that can be attached to the access code that is used to authorize the execution of the system transaction.

Taking into account the fact that this function is sensitive, it is advisable to enter an activity code and to carefully limit the number of users that have the execution right.