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Open Graph Object, books.book, ISBN


n00bster

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i have a "book listing type" where i have set in the seo manager "books.book" for the Facebook Object Type.

i also have a "custom field" ISBN where all books have it's ISBN number stored. 

When i check my book "details sites" in the FB Debugger i get the message that there is a missing "ISBN string":

https://developers.facebook.com/tools/debug/og/object/

 

here a sample link from one of my books:

https://foxality.org/climbing/mediacenter/books/1163-kalymnos-rock-climbing-guidebook

 

how can i fix this?

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