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Some programs use the ID in their identification process. If you have two numbers that are the same they could cause a conflict. At one point I had a problem with Calibre thinking different books were actually the same and not filing them correctly. I haven't had this problem in quite some time, but I don't know if it's because Calibre fixed the issue, or I just don't use the same ID anymore.
I think Sigil will automatically correct that line if it is missing???
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