Upgrade from OEM 11g to 12c: ORA-06532 during repository upgrade

In our 2-system upgrade, during the repository upgrade step, we got an ORA-06532 error:

2013-04-08 13:19:07,497 [Thread-514] ERROR - ERROR:ORA-06532: Subscript outside of limit
ORA-06512: at "SYSMAN.NOTIFICATION_MIGRATION_HELPER", line 576
ORA-06512: at "SYSMAN.NOTIFICATION_MIGRATION_HELPER", line 898
ORA-06512: at "SYSMAN.NOTIFICATION_MIGRATION_HELPER", line 1686
ORA-06512: at "SYSMAN.NOTIFICATION_MIGRATION_HELPER", line 2526
ORA-06512: at line 5
File:/oms/sysman/admin/emdrep/sql/core/11.2.0.1/notification/em_notification_data_upgrade.sql
Statement:DECLARE
l_upgrade_type VARCHAR2(64);
BEGIN
-- Migrate notification rules
NOTIFICATION_MIGRATION_HELPER.MIGRATE_RULES(p_batch_size => 50);

-- Find the upgrade type
l_upgrade_type := em_upgsoln_util.get_upgrade_property(EM_UPGSOLN_UTIL.G_UPGRADE_TYPE);

-- Perform pending violation specific upgrade for 1-system upgrade
IF l_upgrade_type IS NOT NULL AND
l_upgrade_type = EM_UPGSOLN_UTIL.G_UPG_ONE_SYSTEM
THEN
-- Migrate pending violations from aq$mgmt_notify_qtable
NOTIFICATION_MIGRATION_HELPER.MIGRATE_DELIVERY_BUS_DATA(p_batch_size => 25);

-- Migrate pending violations from mgmt_notify_requeue table
NOTIFICATION_MIGRATION_HELPER.MIGRATE_REQUEUE_DATA(p_batch_size => 25);

-- Migrate pending rule engine entries from aq$mgmt_notify_input_qtable
NOTIFICATION_MIGRATION_HELPER.MIGRATE_RULE_BUS_DATA(p_batch_size => 25);
END IF;
END;

Bug 15904251 : UPGRADE OF 11G NOTIFICATION RULES FAIL FOR RULE WITH LARGE NUMEBRS OF CONDITIONS was relevant, but applying it, did not solve the issue.
post_config.sh failed, with error: "No OMS is found to be associated with the current Oracle Home"

To continue, first, run these commands as SYSMAN to the new repository database:

ALTER TYPE EM_RULE_EXPRESSION_ARRAY MODIFY LIMIT 100000 CASCADE;
ALTER TYPE EM_RULE_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_SET_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_COND_ACTIONS_OBJ compile;
ALTER TYPE EM_RULE_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_COND_ACTIONS_OBJ compile;
ALTER TYPE EM_RULE_SET_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_COND_ACTIONS_OBJ compile;
ALTER TYPE EM_RULE_COND_ACTIONS_OBJ compile;
ALTER TYPE EM_RULE_SET_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_SET_DETAILS_OBJ compile;
ALTER TYPE EM_RULE_COND_ACTIONS_OBJ compile body;
ALTER TYPE EM_RULE_DETAILS_OBJ compile body;
ALTER TYPE EM_RULE_SET_DETAILS_OBJ compile body;
ALTER PACKAGE EM_RULE_BAM_INTG compile;
ALTER PACKAGE EM_INCIDENT_RULES compile;
ALTER PACKAGE MGMT_RCA compile;
ALTER PACKAGE NOTIFICATION_MIGRATION_HELPER compile;
ALTER PACKAGE EM_RULE_BAM_INTG compile body;
ALTER PACKAGE EM_INCIDENT_RULES compile body;
ALTER PACKAGE MGMT_RCA compile body;
ALTER PACKAGE NOTIFICATION_MIGRATION_HELPER compile body;

After that, run:

$OMS_HOME/oui/bin/runConfig.sh ORACLE_HOME=$OMS_HOME ACTION=configure MODE=perform

At the end, your OMS processes will be running ["emctl status oms" to verify] and you may login to your new 12c OEM.