'Add BBA Structured Communication Type and change labels from \'reference\' into \'communication\''

@api.model
def _get_reference_type(self):

    res = super(AccountInvoice, self)._get_reference_type()
    res[[i for (i, x) in enumerate(res) if (x[0] == 'none')][0]] = ('none', _('Free    Communication'))
    res.append(('bba', 'BBA    Structured    Communication'))
    return res
