Originally Posted by zozeppelin

Yep, it's garbage. At first I thought it was validating (enforcing adv purchase, min/max duration, fare class availability) but I've ruled that out.

Next mole up?

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Corrections:
I messed up assuming rubles but is dinari - fares seem ok.
Does not appear to be validating fares.
As you mention you can send the additional query to get the fare basis. Why this isn't done automatically is interesting, maybe a web browser has limitations?
Appears the routing rules is now not going to KVS but to [redacted], which ironically also isn't working.