Cannot create container with LDP.EXE

For some reason I cannot create a container with LDP.EXE
I connect and bind with admin rights to the root of the domain. This goes well.

Then I right click on the container where I wan't to create the new container. I select "Add Child".
In the new window I add the following attributes:
DN: CN=CUSTOMERXX-BIND,CN=ProxyUsers,DC=SUB,DC=DOMAIN,DC=DK
objectClass: userProxy
ObjectSid: S-12-xxxxxxxxxx

Then I click Run and in the results pane I get the following message:
***Calling Add...
ldap_add_s(ld, "CN=CUSTOMERXX-BIND,CN=ProxyUsers,DC=SUB,DC=DOMAIN,DC=DK", [2] attrs)
Added {CN=CUSTOMERXX-BIND,CN=ProxyUsers,DC=SUB,DC=DOMAIN,DC=DK}.

This is good (I think)...

Now, when I look in ADSIEdit I see an object under ProxyUsers with the name CUSTOMERXX-BIND, but not a container.

Any help is appriciated - this is driving me crazy.