TERM_0004 — isbn-format-invalid

Error Code: TERM_0004

Message: Invalid ISBN format.

Problematic query:

IS=978-3-16-148410-0

Recommended query:

IS=978-3-16-148410-0

Typical fix: Use a valid ISBN-10 or ISBN-13 format (e.g., 10 or 13 digits, optionally with hyphens in correct positions).

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