We recommend that you check files out of Rational ClearCase before you editing them. However, if you edit a file within WebSphere Studio that is under ClearCase control but is not checked out, WebSphere Studio silently checks out the file if Automatically checkout is the current setting of the When checked-in files are saved by an internal editor preference option.
WARNING: If you are using a shared branch within a dynamic view, the automatic checkout process could create a problem. While you are editing a file that is not checked out, another project team member could check out, edit, and check in the same file before you attempt to save it. When you save the file, the automatic checkout procedure checks out the latest version; when you check in the file, your changes could overwrite changes made by another project team member. Therefore, if you are using a shared branch within a dynamic view, you must check out files before editing them.