[QGIS-Developer] Relation reference misbehaviour?

[Paolo Cavallini]

Hi all,
following the example from
https://docs.qgis.org/3.4/en/docs/user_manual/working_with_vector/attribute_table.html#introducing-many-to-many-n-m-relations
I noticed that it does not work, at least with 3.10.
The default Relation Reference, automatically selected, displays the
value column, and tries to insert the same (which obviously fails, being
a string) instead of the key, which would work.
Changing the widget type, by hand, with a Value relation, makes it work.
Is this a known issue?
All the best.
-- 
Paolo Cavallini - www.faunalia.eu
QGIS.ORG Chair:
http://planet.qgis.org/planet/user/28/tag/qgis%20board/