如果使用用户sysadmin不能够登录，就用以下方法来解决：
Solution
1. Login to SQL*PLus as APPS.
2. SQL>Select ORGANIZATION_ID from HR_ALL_ORGANIZATION_UNITS;
3. SQL> Update FND_PROFILE_OPTION_VALUES
set PROFILE_OPTION_VALUES = ''
where PROFILE_OPTION_ID = 1991
and APPLICATION_ID =0
and level_id = 10001;
4. Commit;
5. Login to Applications.
6. Set the MO: Operating Unit profile to the correct default value for your instance,
if the value you chose in #2 is not the one you prefer as a default.
