Unable to create objects in nested hierarchy of the AD server.

When I am trying to create any user with the dn => " CN=User1,CN=Guest,CN=Users,CN=test,CN=com" , I am not able to create the object but dn => " CN=User1, CN=Users,CN=test,CN=com" works fine. This is happening for all the nested tree structures.

Please have a look or suggest if anything needs to be added for the same.  