attribute type is operational?

[Piotr Wadas <pwadas@jewish.org.pl>]

Hello,
I added some attribute to local.schema. When I include this local.schema
in slapd.conf, it says that attribute type is operational and failed to
start.
Exact error is

/etc/ldap/schema/aci.schema: line 6: attribute type \
"1.3.6.1.4.1.4203.666.1.5" is operational

Is it some special place directoryoperational attributes should be placed
to be valid? below is my attribute definition. I want this attribute
directoryoperational because it's going to be ACI (access control
information) attribute
?
( I do not attach system/server info, because I don't think this is
significant in this case)

-----------------
attributetype ( 1.3.6.1.4.1.146.115.121.1.5
        NAME 'OpenLDAPaci'
        DESC 'OpenLDAP access control information'
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.53
        EQUALITY OpenLDAPaciMatch
        USAGE directoryOperation )