bean-report error messages

Hello beancount users, I'm running bean-check against my ledger and its giving me "No position matches" errors for entries purchasing a commodity. I don't understand what that error could mean on a purchase transaction - if I were reducing lots, it would make perfect sense, but when augmenting

Re: can one reduce FIFO lots purchased in one currency and sold in another?

Thanks for your thorough and helpful response. I think I'd seen Selinger's currency trading accounts post referenced before, but hadn't taken time to read and understand it. Wow. His method does resolve the problem "elegantly," as you say. Unfortunately for me, I believe that the IRS requires