IT Diary (Jun 2021)

A Configuration Item or Configuration Baseline import fails with the error message The CI contains a missing or invalid CI reference. 

Cause: The problem is most likely that the Baseline was exported from a higher ConfigMgr version and that it contains elements that are missing in the release that it is imported to. Example:  The supported platforms may contain a new OS version. The result will look like this:

If you exported the sources yourself it’s probably easiest to modify the CIs. If not this link may be helpful: