Hello,
Check this Article:
Endpoint Protection client warning: "Old Virus Definition File"
http://www.symantec.com/docs/TECH150078
To avoid seeing this message more than once on the client, on the pop-up notification window, clickDon't remind me again until after the next update, and then click Close
EDIT: Don't remind me again until after the next updateoption is only available on the client side pop up not in the SEPM.
You may like to check this Thread with similar query -
https://www-secure.symantec.com/connect/forums/old-virus-definition-file-reminder-message