Diagnosis
In the foreign key maintained in the customer enhancement, youspecified that characteristic &V1& is tied to characteristic &V2&.
This information was adopted by the characteristic catalog of thedrilldown.

System Response
If you choose characteristic &V1& for a drilldown report, thencharacteristic &V2& also has to be used in the same report.
Selection using characteristic &V2& is prerequisite for selection usingcharacteristic &V1&.