Effects of source control on object management
You must check out a target file from source control before
you can modify its properties. If objects in a source-controlled
target are not themselves registered in source control, you can
add them to or delete them from the local target without checking
out the target. However, you must remove a source–controlled
object from the source control system before you can delete the
same object from the local copy of the target (whether or not the
target itself is under source control).
Although you can add objects to a source-controlled target
without checking out the target from source control, you cannot
add existing libraries to the library list of a source-controlled
target unless the target is checked out.
For information on removing an object from source control,
see “Removing objects from source
control”.