ORA-28273: No mapping for user nickname to LDAP distinguished name exists.
Cause : ORACLE server cannot map the given user nickname to LDAP distinguished name.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Make sure user entries in LDAP are correctly provisioned with correct user nickname attribute values.
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.