hi Marco,
yes, we had this problem also . usually there are settings per reader, we have it with our external (Mifare) card readers to block at zero for students.
more for matthew this info, if you use a "print release" station then it works fine.. you can configure as needed.
(release station is basically a standalone PC for releasing prints securely).
Either method saves lots of money, paper, co2 etc stopping prints that you didn't need or print.
We reckon it saves our organisation about £80,000 per year now.