ObjectClass auxiliary - Beginner's question

Hi all,

I have to re-write a shcema but i'm beginner with this. I would like to add some attributes to describe service.

We use a AUXILIARY class to add some attributes :

objectclass ( 1.2.250.1.152.14.2.1.2 NAME 'intService' SUP top AUXILIARY MAY (...))

We have an object using this objectclass and other : dn: idService=196018, dmdName=Services, dc=fr objectClass: intService objectClass: organizationalUnit

Now i would like to transform this object in static group so I use GroupOfnames and I got this error :

Object class violation (65) additional info: invalid structural object class chain (organizationalUnit/groupOfNames)

Why can't I use groupOfNames with organizationalUnit ? Or is it another problem ?

Thanks a lot.