Hi Balaji.
BR*Tools is using system users default password to perform the actions if -u <username>/password or -u / or even -u // is not specified. Either in SDBAC or in command line. As a result ora many ORA-01017 user gets locked because of FAILED_LOGIN_ATTEMPTS parameter set to 3 or 10 (i don't remember anymore). Set it to unlimited if note done already, as documented in note below:
951167 - ORA-28000: the account is locked
Make sure every action in SDBAC table contains at least -u /, -u // or -u system/<appropriate password> to avoid ORA-01017 in the future.
Regards,
János