SAP Message UCD0030 - No special version maintained for the hierarchy

Diagnosis
You changed a version-dependent hierarchy. However, no special versionis defined for the hierarchy in the Customizing for the assignment ofspecial versions to version combinations or in the rules for thisassignment.

System Response
The changes cannot be saved.

Procedure
To reverse the changes, choose Cancel.
Extend the Customizing of the special versions.
Change the hierarchy.