Marty, Speaking from the legacy community point-of-view, we have been discussing the fact that each EDI interchange (set of purchase orders) would be a unique conversation. I cannot recall a single discussion where the concept of a never-ending conversation came up (except for a couple standards bodies but that is a different subject all together). That does not mean that you are not correct in the assumption, only that it appears contrary to my experience. Also, I said that I do not 'recall' and that can provide some hints to my baseline. Ralph ASC X12, Vice Chair