samba - Jun 2004 - InetOrgPerson attributes for machine accounts ???

Helo folks,
evenly I browsed thought-lost through my ldap-tree and saw
that the machine-user-accounts under ou=Computers contain the 
objectclass InetOrgPerson.
The accounts are automatically generated by smbldap-tools (from idealx)
when a computer joins the domain.
I wonder if this is a must, because I don't see any attributes which 
depends on this objectclass.

Thanx

Jeremias