Changed the apps password by using alter user command
1.backup the FND_ORACLE_USERID and FND_USER tables
2.Restore the FND_ORACLE_USERID and FND_USER tables from a backup.
3.Then run FNDCPASS to change the APPLSYS password.
FNDCPASS apps/apps 0 Y system/ SYSTEM APPLSYS WELCOME
Now check the apps username and account_status.
1.backup the FND_ORACLE_USERID and FND_USER tables
2.Restore the FND_ORACLE_USERID and FND_USER tables from a backup.
3.Then run FNDCPASS to change the APPLSYS password.
FNDCPASS apps/apps 0 Y system/ SYSTEM APPLSYS WELCOME
Now check the apps username and account_status.