$form->{forex} = $form->check_exchangerate( \%myconfig, $form->{currency}, $form->{transdate}, 'buy');
$form->{exchangerate} = $form->{forex} if $form->{forex};
$form->{forex} = $form->check_exchangerate( \%myconfig, $form->{currency}, $form->{transdate}, 'buy');
$form->{exchangerate} = $form->{forex} if $form->{forex};