The manager of the checked out project can check it in him/herself by
navigating to the Project Center page and clicking the "Check in my
projects" link in the sidepane on the left. The Project Server
administrator can also check in the checked out project using the steps
detailed in the following link:
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.