Op-Fire Bug in latest MBT / WW2 upgrades.

[low_bidder]

I am still haveing problems. Basically, it doesn't workIf my AT weapon has a PEN of 6 and I set it with a max PEN of 4 and a min of 2, then an armored vehicle with frontal armor of 3 or 4 that is within the set range should be shot at, while one with armor of 5 should be ignored. Or at least that is the way the range filter was supposed to work I could find nothing in the manual on it.
This was tested using the latest patch. Why do you call it op-fire filter? On the screen to adjust it the label is Filter. Since that screen is under (subordinate to) the range screen, I call it range filter. Should I search again in the manual under "op fire filter"?