With the "diagnosis" functions in the Extras menu, you can test the lock management system for errors. There are two test functions:
Diagnosis: Checks that the lock server is responding to lock requests. When a user locks an object, the work process in which the user is active and the lock server must communicate to register and subsequently release the lock.
More information: SAP Lock Concept
Diagnosis in VB: Checks that a lock held for a user transaction can successfully be passed to an update server, used during update processing, and released.
briefly explains how lock management is implemented in a distributed environment.
The section entitled Questions and Answers Regarding Locks contains additional information on these diagnosis functions.