Moved to EPO forum there is a better chance of a similar user seeing this post there.
I believe you need epo hotfix 1144868
The description doesn't match exactly, but did fix it for me when I had the same issue a while back.
Following is taken from the release notes:
This hotfix addresses the issue where the Save button is disabled when adding a process to the On-Access policy for McAfee Endpoint Security (ENS), McAfee VirusScan Enterprise (VSE), or McAfee Management for Optimized Virtual environments (MOVE).
For more information, please see the McAfee Knowledge Base article KB87371.
Thank you for your answer and support. Applied on the Lab, it is working.