I think you're right. My F23 page shows the -03 part but that's it. In the next used block in the lower right, it shows a -07 part which isn't showed on the plans at all. I'm guessing they meant that once you chamfer the corners on the -03 it becomes -07.
Then, on F21 it calls out F23-03 anyway, which I missed when I looked earlier:
I guess it's the same part with a couple different names!