Yes, exactly. You got the behavior.

See https://bugs.launchpad.net/oq-engine/+bug/1188102 https://github.com/gem/oq-engine/blob/master/openquake/engine/db/models.py#L3252 and https://github.com/gem/oq-engine/blob/master/openquake/engine/db/models.py#L3130