%company_14_users = %{ $company->{14}->user };
  ## [blokhead: it's not clear whether %company_14_users is magical or not...]

  $company->{14}->{tax_num} = "111-22-3333";
  $company->{14}->write;

##</code><code>##

  $company_14 = $company->{14};
  $company_14->{tax_num} = "123456";

  # Wrong example:
  # $company->{14}->{tax_num} = "123456"
  # This doesn't work, because it always create a new Row object,