ORA-28275: Multiple mappings for user nickname to LDAP distinguished name exist.
Cause : The given user nickname maps to more than one LDAP distinguished name.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Make sure user nickname is unique within the enterprise.
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.