For bidirectional streams setup, Please run steps 1 through 8 after interchanging Db1 and Db2. Caution should be exercised while setting the instantiation SCN this time as one maynot want to export and import the data. Export option ROWS=N can be used for the instantiation of objects from DB2--> DB1.
/* Perform changes HR.EMPLOYEES and confirm that these are applied to tables on the destination */
insert into hr.Employees values (99999,'TEST','TEST','TEST@oracle','1234567',sysdate,'ST_MAN',null,null,null,null);
conn hr / firstname.lastname@example.org
select APPLY_NAME, ERROR_MESSAGE from dba_apply_error;