[Flow] checked checkboxes from model property

[Nicola Cerchiari]

Hi all,
I got a little problem that it seems I can't solve, even if it looked
pretty obvious to me at the beginning.
I have a model with some relations to other models and one of these
relations is a Collection (ManyToMany) with another model.
The relation is represtented as a group of checkboxes and the persistence
flow works like a charm.
What it seems I'm unable to get it to work is to check the corresponding
checkboxes when I access the edit form of an model record persisted before.

Other relations represented by a selectboxes  work without problems, but
checkboxes never get checked.

What am I missing? Anybody has clues?

Thanks,
Nicola