Transition Tables doesn´t have OID

I´m trying to use transition tables for auditing purposes.

create trigger MyTableAudit_UPD after update on MyTable referencing old
table as Transition_old new table as Transition_new for each statement
execute procedure AuditTable();

create or replace function AuditTable() returns trigger language plpgsql as
$$
if (TG_OP = 'UPDATE') then
  insert into audittable(table_name, oid, audit_action, user_id,
table_schema, values_old, values_new)
  select TG_TABLE_NAME, Transition_new.oid, TG_OP, CURRENT_USER,
TG_TABLE_SCHEMA,  row_to_json(Transition_old.*)::jsonb,
row_to_json(Transition_new.*)::jsonb from Transition_new inner join
Transition_old on Transition_new.OID = Transition_old.OID;
elsif (TG_OP = 'DELETE') then
  insert into audittable(table_name, oid, audit_action, user_id,
table_schema, values_old)
  select TG_TABLE_NAME, Transition_old.oid, TG_OP, CURRENT_USER,
TG_TABLE_SCHEMA, row_to_json(Transition_old.*)::jsonb from Transition_old;
end if;

[42703] ERROR: column transition_new.oid does not exist Where: função
PL/pgSQL audittable() linha 14 em comando SQL

I would like to user OID value because we change our primary keys,
sometimes, OID doesn´t.

So, there is a way to get OID on transition tables ?



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