After you activate the FIELD class, you can define profiles that allow you to control access to fields in the DFP segment of user, group, or data set profiles. (Note that you can allow other users to define such profiles by assigning them the CLAUTH attribute for the FIELD class.) To define a profile for field-level access checking, issue the RDEFINE command and specify the class name as FIELD, the appropriate profile name, and the universal access authority (UACC) as follows:

RDEFINE FIELD profile-name UACC(access-authority)