Key figure (&) no longer exists and will be deleted from the report

What causes this issue?

Key figure &V2& (technical name: &V1&) no longer exists.

System Response

The key figure does not appear in the report.

How to fix this error?

To check this, display the key figure using

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

<DS:TRAN.KDNN>Display key figure &V1&</>

Error message extract from SAP system. Copyright SAP SE.