The detection spell Combat Sense is listed as an *active* detection spell. In the opening section on detection spells, the rules say that active spells are treated as opposed tests versus the target's Willpower + Counterspelling. However, then there are several things to suggest that Combat Sense is different. All of the other active detection spells have references to "net hits" when calculating the results. The Combat Sense spell, on the other hand, only refers to "hits" (not "net hits"). Thus even if there was an opposed test, the opponent's test is irrelvant because the results of the spell is not determined by "net hits" but rather just the hits on the spellcaster's result. Also, this spell is different in that it is a psychic spell that provides a sixth sense. By the description of psychic spells, it does not make as much sense this would be opposed since it is a sixth sense. Finally, from a game play perspective, it would be somewhat cumbersome to have to roll each opponent's Willpower + Counterspelling check each time a new opponent want's to attack the target with this spell.
At a minimum, there is a discrepancy between the reference to the Opposed Test mechanic and the fact that "net hits" are not needed to determine the spell's effects. A clairification would be appreciated.

It wouldn't be for each attack, only roll once for the time the opponent enters the spells area of effect, or Range.

Otherwise just look at this as a case where the word "net" was left out. The general rule on Detection spells should apply unless the specific rule explicitly overrides it. Which it may appear to be in this case, but I would still use Net Hits. Though I suppose that is the question here.

Treat it as a Passive detection spell and all of this complicated crap drops away.

Especially since the Adept Power has no such drek associated with it. It just used its rating (Force).

While you're about it, could you please clarify if the example in the net successes table is correct or not.

Please remember, the target of "Combat Sense" is a Willing Participant, so no test to resist (Unless of course the target is not willing)