Diagnosis
An entry in the view cluster VC_T5GC1 already exists for this car inthe exact same period.

System Response
The system does not allow this change since it is likely a previousrecord has already been updated using the existing data.

Procedure
Check that the car record chosen in the selection is the exact same caras the one to be recorded for the employee. If not choose another carrecord or create the details for the new car. Ensure that Validfrom date is correct.
If you are sure that this is the exact same car, investigate why thisentry was incorrectly entered. Check whether other employees may havethis incorrect entry maintained for them. Should it be necessary tochange the database entry, use viewcluster VC_T5GC1.