Unlike most other rights in VSys, access rights to custom fields default to "Access", meaning that unless access is explicitly revoked ("No access"), a user has rights to a given custom field.
Notes:
In the Profile editor, a custom field for which the user has no access will not appear.
In reports, mail merges and exports, a custom field for which the user has no access will display as blank.
Users can still filter on custom fields for which they do not have access.