Hide party required for non-deferral accounts
With the base account module you can mark any account with party_required boolean, and Tryton asserts that any movement in this account has a party.
You can set party_required to ANY account.
But if the same account has the boolean deferral set to False, there is a problem. When you try to execute the 'Balance Non-Deferral' wizard it fails because it tries to create a new move line of a party_required=True and it doesn't set the party.