Did you use the set target button and attach them to a target on the ground?
I have had some bombers, like the D3A1, that would attack ground targets without being attached to a specific target and others wouldn't unless they had a specific target to attack. Maybe the Pe-2 is one of those that needs to be attached to a target before it will dive bomb?
Pe-2 AI Dive bomb:
http://www.mission4today.com/index.p...topic&p=123945
Wheels