Help: CS1 errors

==<span id="bad_bibcode">Check |bibcode= &lt;message></span>== 
<section begin="bad_bibcode_help_text" />{{help desk}}{{#invoke:Cs1 documentation support|help_text_error_messages|err_bad_bibcode|$1=&lt;message>}}

When {{cs1}} and {{cs2}} templates contain {{para|bibcode}}, a test is done to see if the [[bibcode]] identifier has the proper format.<ref>{{cite web |url=http://adsabs.harvard.edu/abs_doc/help_pages/data.html#bibcodes |title=1.2.3 - Bibliographic Identifiers |website=The SAO/NASA Astrophysics Data System}}</ref>  Bibcodes are expected to match these requirements:
: length must be 19 characters (&lt;message> = '<span class="error" style="font-size:100%">length</span>')
: characters in position(s): (except as specified otherwise, violations produce '<span class="error" style="font-size:100%">value</span>' in the &lt;message> portion of the error message):
:: 1–4 must be digits and must represent a year in the range of 1000 – next year (&lt;message> = '<span class="error" style="font-size:100%">year</span>')
:: 5 must be a letter
:: 6–8 must be a letter, ampersand, or dot (ampersand cannot directly precede a dot; &. (&lt;message> = '<span class="error" style="font-size:100%">journal</span>'))
:: 9 must be a letter or dot
:: 10–18 must be a letter, digit, or dot
:: 19 must be a letter or dot
To resolve this error, ensure that the {{para|bibcode}} value is correct.

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