The import happened fine, all fields were edited fine, but it still didn't work. I deleted the whole thing, and did a re-import, went back through each again, and then it let me through. I don't know what the glitch was, but having to fill in the details of 50+ sales twice, was annoying. But my first advice if anyone else runs into this is - just hit the "trash" button, seethe about having to re-do things again, and then do it again. All the time spent trying to fix it was wasted - just delete and reimport.
