I've run into the same problem. If you're going to merge, you have to
use the _-exact-_ same book that you started with.

For example, I created a shared workbook and sent it out to co-workers
to edit. I also made some changes to mine, and when trying to
reincorporate theirs, I got the same errors as you. Turns out, I had
to reincorporate their edits into the *original* I had sent out.

See if that works (I know you posted awhile ago),
Dan


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