Resumen
The request is well-formed but has semantic errors (e.g. validation failed).
Cuándo ocurre
Widely returned by REST/JSON APIs when field validation fails.
Causas comunes
- Field validation failed (format, range, required)
- Business-rule violation in the payload
Cómo solucionarlo
- Fix the invalid fields per the error details
- Validate input against the API schema
Base en la especificación