When linking a record into a `one2many` relation with command `(4, rid)`, a
query checks whether the record is already linked to the current record id:
SELECT 1 FROM {inv_table} WHERE id={rid} AND {inv_field}={id}
where `inv_field` is the name of the inverse field, and `inv_table` is the
table where this field is stored.
The query is wrong if the inverse field is inherited, because the `rid` does
not belong to the table `inv_table`.
The test has been replaced by a plain ORM access:
rec = obj.browse(cr, SUPERUSER_ID, rid)
if int(rec[inv_field]) != id:
...
This fixes#4685.
085875619f