When adding files to Mandatory Patching the files must be included in the backup selection as well. However, trying to include a file by clicking on the file icon does not select the file (icon display does not change to green). When you right-click on the file, the selection menu is unavailable (greyed out).
Files need to be selected for backup before adding them to the Mandatory Patching area. To fix the problem:
- Remove the file(s) already added from the Mandatory Patching area.
- Include the files(s) in your backup selection.
- Add the file(s) again in Mandatory Patching.
- The files are now included for backup.
Ref: Bug 10873