[Ginestra]

No doubt there's another way to do this, but this 'option' is being used internally only - it's a confirmation code that we can only add when order is marked as complete. Hence not wanting (nor needing) the public to see this option/field.

But we need it, we need it to be stored with each and every completed order. It is subsequently used in voucher-production, extracting information from the xcart order tables.

I hope I've explained (on behalf of OP, one of our coders) clearly.