Question : password

I am facing a situation where  users are assigned a profile Annual_PW and following is the out put  from  dba_profiles

Failed log_in Attempts     3
Password_life_time        365
Password_reuse_time   390
Password_reuse_max  Unlimited
Password_verify_function  null

why i am getting  ORA-28007 fro some users
I was able to extend the other users password with no problem by

alter user gradesch identified by values '5DBAEB6789123V56C';  here the password is same and I want to keep the same password for all users. i must keep the same passwrd and same profile.
I changed the password_verify_function to null already.
thnaks

Answer : password

Intended 9i(and above) Behaviour
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Set either PASSWORD_REUSE_TIME or PASSWORD_REUSE_MAX to unlimited and the
password can NEVER be reused.

When you change the password with the same password, any attempt generates
the expected error ORA-28007, whichever command you use, SQL*Plus command
PASSWORD or SQL ALTER USER ...IDENTIFIED by.