Tap Commodities / Trade Commodities - Which turn?

[emky]

p539 mentioned "RP for the turn", but also refers you to full details on p525, which says that you're selling commodities to get increased RP *next* turn.

Which is it? Preparing for next turn, or selling for immediate use?

(And has anyone compiled a list of errata/etc? I didn't see one. Paizo sadly has a bad habit of never posting/collecting these and expecting everyone will read every post in every forum.)