With the related article import you can define relationships between articles. Only articles that are known in the database can be used for this. If this error occurs, an article is linked to a non-existent article or to an expired article.
Solution:
Find the expired articles listed in the ArticleNumber column and either change their availability or remove them from the import file.
Search for the unknown articles that are listed in the ArticleNumber column and add them to the database or remove them from the import file.
