whew, managed to get it working, by just replacing two files.
If you have already installed cvv2 for entire order and it doesnt work, then..
Download contribution Credit Card with CVV2
and replace the files provided in the mod
1) cc.php - replaces catalog/includes/modules/payment/cc.php
2) cc_validation.php -replaces catalog/includes/classes/cc_validation.php
with the files in your catalog.
and cvv2 for entire order will then work.
The two contributions seem very much the same except cvv2 for entire order doesnt work correctly and should be removed. Or at least moved to a timewaster/ohmygodwhathaveIdone category