SAP Message UGMD067 - &1 is used as a navigation attribute and cannot be deleted

Diagnosis
Characteristic value &V1& is used as a navigation attribute in BW systemV4 in value v3 of characteristic v2. therefore, you cannot
delete &V1&. You can only delete it when the characteristic value isno longer used.

Procedure
If you want to delete &V1&, you must first change characteristic valueV3 of characteristic v2 so that v1 is no longer used.
However, other uses of &V1& can exist. After you have made changes tocharacteristic &V2&, the system may display another use during the nextdeletion attempt. You need to delete all uses displayed. Then you candelete &V1&.