Object & is not defined in ABAP Dictionary

What causes this issue?

The system cannot display the fields of the specified object as it is
not defined in the ABAP Dictionary.
The object will most likely not be defined in the ABAP Dictionary in
the future.
It is also possible that the object may have been deleted from the ABAP
Dictionary after the performance trace.

System Response

Processing continues after the error message.

How to fix this error?

If the object is only defined in the database, you can display a
description of the object using database tools.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.