Donc si vous avez prévu de voyager

Hi Susan,

As I see it  -- if a trip is planned, this is an action that takes place before the event of the trip.

So it is a completed task.

This is why I believe that the passé composé is appropriate.

Hope this helps.

Jim

I made the same mistake in talking to a native speaker this week and he explained the use of the passé composé exactly as Jim suggested.