The worksheet includes a status summary section that shows the current status, and a count of any errors, warnings, and comments associated with the worksheet.
You can view the details of the errors and warnings in the Problems panel. See Toolstrip.
You can click the number shown next to Comments to view any comments that were added to the worksheet, and a record of status changes (for example, submitted or approved). You can also add a new comment to the worksheet by entering the text in the provided field, and then clicking Post. When you’ve finished, click the X.