Appreciate this greatly, this is helpful.

When I type in ONLY my KLM legs (SFO-AMS-PEK, TPE-AMS-SFO) it says I am not allowed.
If I through in my confirmed China Eastern ticket, SZX-TPE, then it says the 240 TWOV is allowed "with extra documentation." While it doesn't elaborate, I assume that means proof of a confirmed onward ticket to a 3rd region.

So the question is - is standard usage of this tool to put in all flights for a particular trip, or only the KLM flights? What the agent sees largely hinges on this.

Thanks again.