To edit an object, you must check out the object. When you check out an object, the repository obtains a write-intent lock on the object. No other users can edit the object when you have it checked out. If you disconnect from the repository and do not save the object, it remains checked out to you, but you lose the changes you made to it.
An object is checked out by default when you create, copy, replace, or import it.
To check out an object:
Select the object you want to check out.
Click Versioning > Check Out.
In the Check Out dialog box, enter an optional comment in the comment field.
Click OK to check out the object, or Apply to All to apply the checkout comment to multiple objects.