Restoring References
Video: Restoring References
It's possible that you might have inserted a reference from your project that you deleted later on (either intentionally or unintentionally). You can copy the reference from your Word file into your Citavi project.
1 References no longer in your project have a gray question mark next to them: 
URL: https://www1.citavi.com/sub/manual7/en/index.html?wai_restoring_references.html, updated: 2025-05-20