Ok, I think I got it. I was using a 'SUP inetOrgPerson STRUCTURAL' to my new scheme. So, when I've changed to 'SUP top AUXILIARY' I finally could add my new attributes. I think it's because ldapmodify was trying to modify the structural object to my entry and it's impossible (just at creation time). So, here's my ldif (it's working): dn: uid=unicorn,ou=ground,dc=dinosaurs,dc=jurassic,dc=history changetype: modify add: objectClass objectClass: oilCorporation - add: oilCorporationTypeOfThing oilCorporationTypeOfThing: withcandle []'s Alexander Brazil - Rio de Janeiro ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.