The AB configuration &1 is still being used and cannot be deleted

What causes this issue?

You are trying to delete an action box configuration although it is
still being used in the determination table EWFFND.
This is not possible.

System Response

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

How to fix this error?

First modify the determination table EWFFND so that the configuration
'&V1&' is no longer being used.
Afterwards, delete the action box configuration.

Error message extract from SAP system. Copyright SAP SE.