postgres リストア時の ERROR: duplicate key value violates unique constraint "pg_largeobject_metadata_oid_index"

ERROR:  duplicate key value violates unique constraint "pg_largeobject_metadata_oid_index"
DETAIL:  Key (oid)=(xxxxx) already exists.
ALTER LARGE OBJECT

In one of my odoo database, I ran this SQL query in PGAdmin III to delete the largeobject :

SELECT lo_unlink(l.oid) FROM pg_largeobject_metadata l;

After, I ran the backup script ans the error is no more there.

https://www.odoo.com/forum/help-1/question/what-is-this-large-object-in-many-odoo-databases-115980