An administrator can choose to change a plan status to Complete even if data has not been entered. You can mark a plan complete by following these steps.
From the left hand side, click Plans and click the More Options ellipses next to the plan title.
Choose Mark as Complete and the status will change to Complete. You'll also receive a notification at the bottom of the page.
Once a plan is marked complete, organizations will no longer be able to enter data.
To reopen a plan, you can follow the same steps, except you are select Re-open as shown below.