Thanks for the info. Very useful.
The warning is gone but now when I upload the new Apk I don't the usual option 'Post Into Production'. It is not there.
I had to save as draft, save as Alpha, and then finally was able to publish.
Odd, but it seems to have worked.
I appear to be having another (unrelated?) issue since upgrading though.
I will post a new thread if I can't figure it out.
Thanks again for the reply.