I've been looking at the Fixer-Shark-Charlatan branch of scum in preparation for advancing a character that way and I have a question that wasn't satisfied by the errata (I have an FFG print of the core rulebook).

In Fixer Inquiry +10 is available at a cost of 100xp. In Shark Inquiry +10 is available at a cost of 100xp. Is the entry in Shark meant to be Inquiry +20?

Though the errata doesn't say it (it seems to skip past that Scum pathway in its entirety), I would presume so. There is no Inquiry+20 at Charlatan, just the two +10s in the two previous ranks.

I don't think anyone would complain if you tweaked the second one to be a +20 instead. It's not like it's broken or anything, especially at Rank 7.