$form->{"amount_$i"} = $ref->{amount} / $ref->{exchangerate};
$form->{"due_$i"} =
($ref->{amount} - $ref->{paid}) / $ref->{exchangerate};
$form->{"amount_$i"} = $ref->{amount} / $ref->{exchangerate};
$form->{"due_$i"} =
($ref->{amount} - $ref->{paid}) / $ref->{exchangerate};