This access code makes it possible to prohibit access to the current record for some users.
As a matter of fact, if the field is completed, only the users having this access code with read rights (respectively write rights) can view (respectively modify) the concerned 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.