No log exists for the selected entry; see long text

What causes this issue?

CASE &V1&.
WHEN 'CONVERSION'.
No log exists for this table.
<ZH>Note</>:
If a log exists for a table, the respective table name is marked with a
"#".
WHEN OTHERS.
No log exists for this program.
<ZH>Note</>:
If a log exists for a program, the respective program name is marked
with a "#".

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?

ENDCASE.

Error message extract from SAP system. Copyright SAP SE.