Some time when you try to open or schedule in primavera, you get this message:
“You have opened the current project(s) in Shared mode. Other users currently have the project(s) open as well. Performing this process may overwrite the changes made by others. Are you sure that you want to continue?”
You can solve this issue in two steps.
Step No. 1
Click on File, then click open.
Step No. 2 :
Choose the access mode as exclusive