Field with type 'Term Reference' (only if I use View as data source) display N/A as first value I have a field with type 'Term reference' and widget 'Check boxes/radio buttons'.
As a first value I have a N/A and I've no clue why it appears there.

Term reference works fine if I do not use View.
It's not required to be filled.



Is it possible to remove it in proper way?

Thanks.
A very late answer, but hopefully it will still help you.
I think if you change the term reference field, you have an option if it is optional or mandatory the field. When you choose mandatory, it should be removed that option.