分类:含有无效ISSN的条目

本页面是一个维护分类，用以维护维基百科计划。由于并非百科全书的一部分，因此本分类或是不含条目页面，或是按状态而非主题收录条目页面。请勿将本分类包含在常规的分类页面中。 本分类另有以下功能： 隐藏分类：除非在“参数设置 → 外观”中勾选“显示隐藏分类”，否则本分类将不会在常规页面中显示。 追踪分类：将一批具有相同状态或相同问题的页面汇总于此，便于编者统一维护，并持续监视维护进度。

致管理员：即使本分类不含任何页面，也请不要将其删除！ 本分类有时甚至大部分时间可能是空的。

This is a maintenance category for articles with invalid ISSNs. It is sometimes added by the template {{Please check ISSN}}, which should be located next to the ISSN with the problem.

Articles can also be included in this category if an ISSN used in an {{ISSN}} or {{ISSN link}} template is not valid.

The most likely reason is a bad checksum, (see ISSN) which probably means there is a typing error in the ISSN. Also, ISSNs that are not eight digits in a 4-4 pattern (i.e.: ISSN 1234-5678) will return an error message. Use an upper-case "X", not a lower-case "x", if "X" is the final character in the ISSN. The two groups of four characters are joined with a hyphen, not a dash.

See also Category:CS1 errors: ISSN