Set svn:needs-lock property

Setting svn:needs-lock on a file specifies that only one user can modify it at one time.

1. Use SCM >> Properties from the right-click context menu on a file to make changes to SVN properties.
   
2. Use the plus sign to add a new property. Select svn:needs-lock from the Property name list.
3. Set the Property value to *.
   

   Figure 1. Set svn:needs-lock