Quote:
Originally Posted by MarjaE
I am trying to log some of the books in my library, including a hard copy of Maitland's Domesday Book and Beyond.
The listed isbn is 0 521 34818 4
I have tried entering with spaces, with dashes, and just with digits. In each case I get the above error.
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4 is the MOD11 (0-9 X) check digit.
invalid says the processing of the other digits did not compute to 4 (calibre used to show Red if it was wrong. Calibre also stripped spaces and dashes for the check, so all those ways should have been fine