Hello, yes, seems like problem with newest VirtueMart (2.0.11 and 2.0.12). We will fix it immediately in next release.

today?

Yes, today. If you want to fix that immediately (i can imagine that it is anoying for customers), open file administrator/components/com_vminoice/helpers/invoicehtml.php, find line +- 1745 (may differ), find line where is

foreach ($this->calcRules as $rule){

and after it, insert

if (!empty($rule->virtuemart_order_item_id)) //VM 2.0.12, trash rules for products
continue;
if ((string)$rule->calc_amount==0) //skip rules with no amount
continue;

Note that if your PDFs are cached (they have green background), you need to switch on and off some config settings or empty your invoices folder to refresh cache. I hope it will work.

Ok, Thank you very much.