ORA-22915: cannot ALTER a nested table's storage table to ADD/MODIFY columns
Cause : ayn usc hcahneg.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
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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.