Theresa wrote: "I am trying to update the ISBN for this Sept. 2012 edition, which I have made my primary. ISBN-10 is 1938752007, ISBN-13 is 9781938752001. It says I must go through this group. The June 2012 editio..."
Mustn't do that.
If you have a new ediion of a book with the OLD numbers then we use an alternate cover edition. Removing the ISBN for an existing edition is not allowed unless the old one was wrong.
I've also reverted your "Out of print/withdrawn edition" description change.
ISBN-13 is 9781938752001. It says I must go through this group. The June 2012 editio..."
Mustn't do that.
If you have a new ediion of a book with the OLD numbers then we use an alternate cover edition. Removing the ISBN for an existing edition is not allowed unless the old one was wrong.
I've also reverted your "Out of print/withdrawn edition" description change.