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On quick look at your question, it seems to me that you are overcomplicating your process. A simpler but equivalent translation of your problem is the following:

"In order to be able to to pickup the van, I first need to 1) book the van and 2) find my driver's license. Tasks 1 and 2 may occur in parallel."

If so, all you need to do is create a group task containing "book van" and "find driver's license" in parallel. Then link that group task sequentially with "pick up van."

Or am I missing something?