Ah, here it is in the FAQ: "When selling a mutual fund to purchase a fund in a different family, you are selling the mutual fund you own and using the proceeds

Ah, here it is in the FAQ: "When selling a mutual fund to purchase a fund in a different family, you are selling the mutual fund you own and using the proceeds to purchase another fund in a different fund family. Since you are performing a cross family trade, the settlement date for the sale will differ from the settlement date for the purchase. Typically, cross family trades execute over two business days."