BRB pg 58
"If the unit that has been charged as a result of a pursuit was not engaged in combat from the beginning of this combat phase, or if it was engaged but that fight has already been resolved in this combat, phase the combat is not resolved straight away, but in the combaty phase of the following turn.
In the following turn's combat phase the pursuers will still count as charging.
This might result in both sides having charging units on both sides will get the normal bonuses conferred by charging (eg causing impact hits, benefiting from a lance's Strength bonus, etc. and other bonuses described later in the this rules section. Also, both sides will get the +1 combat resolution bonus, which will effectively cacel each other out."
BRB pg 71
"Impact hits are only made on the turn the model charges into close combat. If the model with Impact Hits is itself charged, or is fighting in a second or subsequent round of combat, then this rule gives no benefit. note that if the model does not complete the charge for any reason...."
I quoted the rules exactly how printed in the book (with the typo and all see if you can find it)
I bolded the parts that are causing the debate. Finding conflicting rules in WHFB is nothing new, though rare to find them in the same book. While I am a HUGE fan of RAW (not because I'm WAAC, but because I want to play WHFB and not playing by the rules as written means I'm playing something else) I have to say that I think the intent of this is clear to me. The Impact hits rules were poorly written (no surprise here). I believe that in trying to clear up that Impact hits only happen on a successful charge and only on the first round of combat for the charging unit they over convoluted the wording and created this issue. p. 58 would seem to back up this idea. While the wording on 58 does specifically mention overrunning and persuing that is because it's under that section of the BRB. In truth this is a fault with the EAB. Crudd is not a good writer, he isn't a WFB player, he's a 40k player. Sometimes things like this escape the writer, especially one not entierly familier with the rules set. Even though you'll normally find me arguing for RAW, in this case I have to say that RAW is conflicting and RAI seems pretty clear.