& not found. The object will NOT be deleted in the target system.

What causes this issue?

The object could not be found during the export.

System Response

For this specific object type, there is no automatic deletion in the
target system.

How to fix this error?

If you have created this entry in the transport request manually, or
have included another request as a reference, the deleted object must
not be transported. You can therefore remove the entry from the
transport request.
If you still want to delete the object, you must create an object with
the same name and type and then delete it. The semantics of the object
do not matter here. The Transport Organizer uses the same request to
log this change.

Error message extract from SAP system. Copyright SAP SE.