Ok casting ressurection on this topic.
Imagine this situation:
You charge at some enemy, and doing so you provoke an oportunity attack from another enemy that is adjacent to you or that you pass nearby. That enemy uses trip as his AoO without having improved trip, an action that also provokes an AoO this time from you on him.
My question is, Can you use this AoO and complete your charge or if you choose to use the AoO action you must stop your charge(since as charge description you cant do anything else)?