ok the psyker in the main book is considered a Supine Class member and gets income of 70 thrones a month off the back of that.

IH states that anyone with a trade skill is considered trade class for purposes of income and thus 120 Thrones a month.

All psykers start with either Trade - Merchant or Trade- Soothsayer

So all psykers are Trade class? Despite being listed as Supine class in the main book.

I think it's a standard oversight, the sort of thing that happens all the time when person A worked on Book B and Book C...

Any other info out there on official erratta for this?

princeearwig said:

Nope. You have to think for yourself on this one. A common take is to use trade income for PCs who actively... trade while using the psyker income for those who for some reason doesen't want to or can't let himself trade.

Or you can ignore the rules in IH as they're pretty much optional.