Nested form with a N-N relation and a predefined list of elements to choose


I recently had to deal with nested form, and I found quite complex to
handle it with my situation.

I have a list of choices and want to allow the user to use some from a
predefined list, by using checkboxes.

I posted the question on Stack Overflow a few days ago, but nobody
answered yet.

So, to not duplicate the text, here is the link:


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