Problem using custom scheme with Apache Directory Studio

[Weishäupl . Frederik]

Hi,

I've a question regarding adding my own custom schema "Kunde" in Apache 
Directory 1.5.6. I created a custom objectclass 'Kunden' with a custom 
attribute 'customerId':

Objectclass 'Kunden':
objectclass ( 1.2.3.4.5.6.7.8.1 
        NAME 'kunden' 
        STRUCTURAL 
        MAY customerId 
 )

Attributetype 'customerId':
attributetype ( 1.2.3.4.5.6.7.8.0 
        NAME 'customerId' 
        EQUALITY caseIgnoreMatch 
        SUBSTR caseIgnoreSubstringsMatch 
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 
        SINGLE-VALUE 
 )

I imported the new schema to Apache Directory successfully. In Apache Directory 
Studio I can see my new scheme under ou=schema,cn=kunde.

Unfortunately I'm not able to select my new objectclass when I try to add a new 
LDAP Entry with Apache Directory Studio. Even in the scheme browser I can't 
find it.

Any suggestions? Thx a lot in advance.