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Originally Posted by KevinH
I did not think kindlegen even generated an ASIN field? Does it?
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No it doesn't.
It's just another of those things that affects whether something shows up as a 'book' vs a 'document' on some devices. Usually, just the non-empty presence of the 113 EXTH record is enough for those devices that check for it. I'm not familiar with the 504 record myself, but maybe it's the same scenario?
Maybe it would be best to let the user choose what they want to put into the ASIN record(s)... if at all possible? I've never seen them contain a uuid-looking string like was previously mentioned. I've only ever seen them contain the usual 10 character Amazon ASIN string. *shrugs*