Today one of the developer opened the SSAS project using SSDT (Visual Studio) and found there were no locks of TFS. In other words the TFS association with project was lost. When we navigate through source control explorer we could see the project in TFS.
To fix this issue we did TFS binding. How?
In the open project in SSDT / Visual Studio, select the solution file and navigate to:
File => Source Control => Advanced => Change Source Control.
If you see SERVER NAME and SERVER BINDING missing. That is the problem.
Just click on BIND.
We had to do twice, once for solution file and other for project file.