1) Restart database instance
2) Check user status with below query:
select username, account_status from dba_users;
do - alter user account SAPSR3 account unlock: if it is locked
3) Check the schema owner using below query:
select owner from dba_tables where table_name="T000";
4) Make sure that it returns SAPSR3
5) If it is SAPSR3, then go to brtools and change the password of SAPSR3
6) Do R3trans -dx, start SAP instance.
If it throws an error, then paste the error lines from dev_w0.
Regards,
Nick Loy