Editing Help:CS1 errors (section)

==<span id="invalid_isbn_date">ISBN / Date incompatibility</span>==
<section begin="invalid_isbn_date_help_text" />{{help desk}}
{{#invoke:Cs1 documentation support|help_text_error_messages|err_invalid_isbn_date}} – this error message hidden by default

[[ISBN]]s were created c. 1965.  Books published before that date will not have been issued an ISBN.

To resolve this error:
: remove the ISBN when citing a source published before 1965
: if the edition of the cited book was published after 1965, ensure that {{para|date}} or {{para|year}} has the correct publication year.
:: adding {{para|orig-date}} may be appropriate in such cases; e.g., {{para|orig-date|1st Pub. 1929}}

Pages with this error are automatically placed in {{#invoke:cs1 documentation support|help_text_cats|err_invalid_isbn_date|pages=yes}}.<ref group="lower-alpha" name="categories" /><section end="invalid_isbn_date_help_text" />