I've read several reports about specific cables saying something to the effect of "this was one piece of intelligence being reported home, but we actually don't

I've read several reports about specific cables saying something to the effect of "this was one piece of intelligence being reported home, but we actually don't think its true". I.e. a bunch of papers ran with the news that Iran had missiles from North Korea we had previously said they didn't have, but it turns out the one cable saying that was incorrect information. (or so they say).