Delete MASTER Node: Rollback ADD_NEW_MASTERS Procedure

I am trying to add a new master database into existing replication cluster using API DBMS_REPCAT.ADD_MASTER_DATABASE. The system returned error : ORA-23493: “REPC.US.ORACLE.COM” is not a new site for extension request “57C8B3C5C100528AE0440060B0C193C6”

Full Rrror : ERROR at line 1:
ORA-23493: “REPC.US.ORACLE.COM” is not a new site for extension request
“57A6AC50B2801525E0440060B0C193C6”
ORA-01403: no data found
ORA-06512: at “SYS.DBMS_REPCAT_ADD_MASTER”, line 2640
ORA-06512: at “SYS.DBMS_REPCAT”, line 1200
ORA-06512: at line 2

Please see post “add-a-new-node-using-add-master-database-group-quiescing-method”

repA>select * from dba_repextensions;

.Master
Definition
EXTENSION_ID REQUEST Site?. EXP REPCATLOG_ID
——————————– ————— ———- — ————
EXTENSION_STA FLASHBACK_SCN BRE BRE PERCENTAGE_FOR_CATCHUP_MDEF
————- ————- — — —————————
CYCLE_SECONDS_MDEF PERCENTAGE_FOR_CATCHUP_NEW CYCLE_SECONDS_NEW
—————— ————————– —————–
57C8B3C5C100528AE0440060B0C193C6 ADD_NEW_MASTERS REPA.US.OR NO 17
ACLE.COM
INSTANTIATING 384340 NO NO 80
60 80 60

repB> select * from dba_repextensions;

.Master
Definition
EXTENSION_ID REQUEST Site?. EXP REPCATLOG_ID
——————————– ————— ———- — ————
EXTENSION_STA FLASHBACK_SCN BRE BRE PERCENTAGE_FOR_CATCHUP_MDEF
————- ————- — — —————————
CYCLE_SECONDS_MDEF PERCENTAGE_FOR_CATCHUP_NEW CYCLE_SECONDS_NEW
—————— ————————– —————–
57C8B3C5C100528AE0440060B0C193C6 ADD_NEW_MASTERS REPA.US.OR 15
ACLE.COM
INSTANTIATING NO NO 80
60 80 60

repC> select * from dba_repextensions;

no rows selected

Solution: BEGIN
DBMS_REPCAT.UNDO_ADD_NEW_MASTERS_REQUEST ( extension_id => ’57C8B3C5C100528AE0440060B0C193C6′ , drop_contents => FALSE);
END;

now

repA>select * from dba_repextensions;

no rows selected

repB>select * from dba_repextensions;

no rows selected

repC>select * from dba_repextensions;

no rows selected