SAP Message UCM0991 - Customizing settings for special versions are incomplete

Diagnosis
You are accessing version-dependent Customizing or version-dependentmaster data. However, no special version is defined for this in theCustomizing for the assignment of special versions to versioncombinations and in the rules for this assignment.

System Response
The Customizing or master data cannot be read correctly.

Procedure
Complete the Customizing of the special versions.