Diagnosis
The virtual field has at least one BAdI implementation (&v1&).The virtual field cannot be deleted.

Procedure
Use Implementation to branch to the BAdIimplementation and choose one of the following options, depending on thesituation:

• Delete the entry for the virtual field from the filter settings of the
implementation, if the implementation is being used for other virtualfields, or

• Delete the implementation, if it is not being used elsewhere.