Steps to Check in project :
1. Connect the SQL Server Mgmt Studio.
2. Need to make change to the Drafts & Published Database.
3. Open MSP_Project in Tables. You will see a list of projects as in attached ProjCheckout1.JPG (Click image to enlarge)
4. Scroll right till you see the column Proj_Checkoutby as seen in ProjCheckout2.JPG(Click image to enlarge)
5. Change the value to null as seen in the attachment.