"Nigel, I don't understand something I've just received. I was reviewing the accounts payable for next month and I noticed that one of our suppliers, Silverfish Enterprises, has sent us a document. We just bought from them two months ago and we were given a payment term of 60 days. The document from Silverfish now says that when their invoice comes due in 30 days, we should direct payment of the amount we owe to Gensuch Financial Institution instead of to them. I checked our records and it turns out that Silverfish still has the same general banking information, so they have not changed banks. Silverfish has only given us this instruction for this particular invoice. Do you know what's going on?