ORA-08177: can't serialize access for this transaction

We are faced with ORA-08177: can't serialize access for this transaction
On the next sql run in the order of appearance is:

0-SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
1. update date_allocated_number set dan_number = 1 where sng_id = 1;
2 - Select min (dan_number) dan date_allocated_number where sng_id = 1;
3 update sequential_number_group set sng_number = sng_number + 1 when sng_id = 1;
4 - Select sng_number from sequential_number_group where sng_id = 1;
5 - Insert into a values (2,1,sysdate,1,'N',1,1) date_allocated_number (dan_id, sng_id, dan_dttm, dan_number, dan_delete_fl, dan_version_id, ptn_id);
6 - INSERT INTO SID. SEQUENTIAL_NUMBER_GROUP (SNG_ID, CMP_ID, SNG_NAME, SNG_NUMBER, SNG_DELETE_FL, SNG_VERSION_ID, PTN_ID)
VALUES (1, 374, 'Case number Group', 1, 'n', 1, 1);
7 validation;

get ORA-08177: can't serialize access for this transaction

This is observed in Oracle11g.

Thank you
SID

What version of Oracle?

Are there already data in DATE_ALLOCATED_NUMBER or is it empty? (e.g. creation of segment delayed)
See Metalink - ORA-08177: can't serialize access for this Transaction After Upgrading To 11.2 [ID 1285464.1]

Tags: Database

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