Update conflict resoltion ORA-01403: no data found

Question

I have set up multimaster replication environment with two database and I have implemented Update conflict resolution on a table using DISCARD method(Oracle provided) as below.
Some how it is not able to resolve the conflict and I am getting erro ORA-01403: no data found.
On MDS(M1) I run the follwing SQL
update menu_code
set ipp_uid = 20
where id = 4;
commit;
on master(M2) database in table menu_code row with ID=4 doesn't exsit.
When I apply deffred transaction that gnerated by above SQL
I get ORA-01403: no data found and ofcourse trnsaction doesn't apply to db and goes to deferror. Since I am using DISCARD method
it should be resolved and not to gnerate error message.
Here is detail info.
Table name: menu_code
--creating column group
BEGIN
DBMS_REPCAT.MAKE_COLUMN_GROUP (
sname => 'SYNAPSE',
oname => 'MENU_CODE',
column_group => 'MENU_CODE_CG1',
list_of_column_names => 'id,ipp_uid');
END;
-- adding update conflict resolution
BEGIN
DBMS_REPCAT.ADD_UPDATE_RESOLUTION (
sname => 'SYNAPSE',
oname => 'MENU_CODE',
column_group => 'MENU_CODE_CG1',
sequence_no => 1,
method => 'DISCARD',
parameter_column_name => 'id,ipp_uid');
END;
--regenerating support for the table.
BEGIN
DBMS_REPCAT.GENERATE_REPLICATION_SUPPORT (
sname => 'SYNAPSE',
oname => 'MENU_CODE',
type => 'TABLE',
min_communication => TRUE);
END;
Thanks.
Pravin

Answer 1

You are absolutely right. Now we decided not to write any conflict resolution routine at all.
Non MDS database is read-only till fail over. After fail over non MDS (other master) will allow insert/update operation.
To fail back to MDS we will write our procedure/function, out side of Oracle conflict resolution( both database will be in Read only mode during synchronizing).
We will delete all deferred transaction/error form the queue and once data transfer is complete, again MDS becomes primary database to use.
Oracle conflict resolutions are to complicated and has lots of overhead and maintenance.
Thanks.
Pravin