Good morning. I wonder what you mean SEP event "scan Omissions" Thank you very much.
Read this documet
There are thing that cannot be scanned and are omitted
"Could not scan [#] files inside [path][filename] due to extraction errors encountered by the Decomposer Engines" during a scan
http://www.symantec.com/business/support/index?page=content&id=TECH99755&locale=en_US