ORA-04094: table string.string is constraining, trigger may not modify it
Cause : A trigger attempted to modify a table that was constraining for some referential constraint of a parent SQL statement.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
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.