I create a new site definition by copying the default, and adding a new mapping for my new site.
Then create a structure home page, newsoverview and news.
opening news overview does not give any result.

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This is due to the fact that when you create a news page, it does not autogenerate a date for the news item. However, this is required for it to show up on the news overview.

Two possibilities to circumvent this issue:

• Have stkNewsOverview display news without date (at the end of the list).
• Autogenerate a date for news pages (current date).