Remove NONE value with Behaviour

[Maru]

Hi Community, 

I'm trying to remove the NONE value from a cascade select list with Behaviour.

I want people to be able to edit the custom field values but not be able to select the none value, so I thought the only way was remove it.

I read that everybody can do it with Bahaviour, but how I make it?

Thanks!

[kiranmai.genkolla]

Hi @Marina Perez 

do u get any solution for this . iam correctly need ur help if u have done it