Diagnosis
You have tried to remove characteristic &V1& from the externalcharacteristics. However, specifications for this characteristic stillexist in hierarchies. For example, in hierarchy &V2& under node ID &V3&
.

System Response
The characteristic cannot be removed from external characteristics.

Procedure
If you want to remove the characteristic, all nodes for InfoObject &V1&have to be removed from all hierarchies for the basic characteristic.