It is considered a best practice to review the SYS-Unidentified Items Document Type periodically to ensure that your processes are correctly configured.
Ideally, there should not be any items present; however, occasionally an unidentified item may be processed. It is possible that the unidentified document may have been created by an extra form feed or an extraneous character, but it is also possible the unidentified items may be vital documents.
If the unidentified item is an actual document, the process must be corrected. It is vital to determine the cause of any errors and correct it.