ok, that was my problem: I didnt know about the "program: " statement at the beginning of my rule.
I think, by doing for "old" isbns test(strlen($#isbn)<=10, it would go, but unfortunately i have some strange isbns like 4038858104508, which would stay black...
Hmmm, maybe not so bad.
Yep, works!
Thank you very much, you made my day and i learned something new!
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