The Company Administrator goes to Company > Admin > Preferences
Select "Enable mandatory progress notes for the Actions" from the list.
Double click in the Configuration Details to edit the information in the right hand panel.
Use the radio button to select Yes / No. and then set a % for the target value.
Click the Save button on the top left to keep any changes.
If set to Yes, whenever the actual result is below the threshold the note icon will turn red asking for a comment to be added. This will continue to show as needs updating until an explanation is provided: