Cause: A role granted was IDENTIFIED
GLOBALLY. Global roles can only be granted via a central authority for the
domain.
Action: Use ALTER ROLE to change the
type of role (from IDENTIFIED GLOBALLY to other, such as IDENTIFIED BY
password), or allocate it to a global user via the central
authority.

Relared Errors:
ORA-28022:
cannot grant external roles to global user or role
ORA-28023: must
revoke grants of this role to other user(s) first
ORA-28024: must
revoke grants of external roles to this role/user
ORA-28025:
missing or null external name
ORA-28026: user
with same external name already exists
ORA-28027:
privileged database links may be used by global users
ORA-28028:
could not authenticate remote server
ORA-28029:
could not authorize remote server for user string
ORA-28030:
Server encountered problems accessing LDAP directory service
ORA-28031:
maximum of string enabled roles exceeded