Auto increment (uidNext and uidNumber)

Hello,

Based on this article: http://www.rexconsulting.net/ldap-protocol-uidNumber.html. I am trying to increment 'uidNumber'. For doing that, I am using this LDIF file:

--------------- autoinc.ldif ---------------------------

dn: cn=uidNext,dc=example,dc=com changetype: modify delete:uidNumber uidNumber: 610 - add: uidNumber uidNumber: 611

------------------- EOF --------------------------------

And this command; but produce an error:

$ ldapadd -x -D "cn=Admin,dc=example,dc=com" -wsecret -f ./autoinc.ldif

adding new entry "cn=uidNext,dc=example,dc=com" ldapadd: Undefined attribute type (17) additional info: add: attribute type undefined

$

This is the definition of the uidNext objectClass:

---------------------------------------------- objectClass ( 1.3.6.1.4.1.4203.666.599 NAME 'uidNext' SUP top STRUCTURAL MUST ( cn $ uidNumber ) ) ----------------------------------------------

Any idea of what I am doing wrong here?

Thanks in advance. Pablo.