def get_proficiency_notification_session_for_objective_bank(self, proficiency_receiver=None, objective_bank_id=None):
raise Unimplemented()<EOL>
Gets the OsidSession associated with the proficiency
        notification service for the given objective bank.

        arg:    objectiveBankId (osid.id.Id): the Id of the
                ObjectiveBank
        return: (osid.learning.ProficiencyNotificationSession) - a
                ProficiencyNotificationSession
        raise:  NotFound - no objective bank found by the given Id
        raise:  NullArgument - proficiencyReceiver or objectiveBankId
                is null
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - supports_proficiency_notification() or
                supports_visible_federation() is false
        compliance: optional - This method must be implemented if
                    supports_proficiency_notification() and
                    supports_visible_federation() are true