Freeing a lock
Under normal circumstances, a data set or member is locked when the client opens it in edit mode, and freed when the client closes the edit session.
Certain error conditions can prevent this mechanism from working as designed. In this case, the user holding the lock can be canceled using RSE’s modify cancel operator command, as described in "Operator commands" in the Host Configuration Guide (SC27-8437). Active data set locks belonging to this user are freed during the process.