$form->{creditremaining} -= $amount;
$form->{"sellprice_$i"} = $form->format_amount(\%myconfig, $form->{"sellprice_$i"}, $decimalplaces);
$form->{"qty_$i"} = $form->format_amount(\%myconfig, $form->{"qty_$i"}, $dec_qty);
$form->{creditremaining} -= $amount;
$form->{"sellprice_$i"} = $form->format_amount(\%myconfig, $form->{"sellprice_$i"}, $decimalplaces);
$form->{"qty_$i"} = $form->format_amount(\%myconfig, $form->{"qty_$i"}, $dec_qty);