The ISBN column is not a discrete column - its a an entry in the the IDs column, which is a list, In that list ISBN looks something like 'isbn:1234567890123', an Amazon id looks something like 'asin:123456789' etc.
As I understand matters, the 'only sensible' way to get values into the IDs columns is via a metadata download plugin, and that the calibre IDs column implements the Dublin Core identifiers element. I am not sure that PDF metadata is DC compliant, unless its embedded as XMP, I suspect PDF XCHange doesn't 'support' XMP encoded metadata - at least not the free version.
Why don't you create a custom column for your version number, using the built in columns for other than there designated purposes (especially the IDs column) is a) not a good idea -- if for no other reason that it's usually a poor design decision, and b) it is unnecessary given how easy it is to create your own custom columns.
BR
Last edited by BetterRed; 04-02-2015 at 07:30 PM.
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