Can't export to system view while node locked

Can't export the workspace into system view while a node in the workspace locked, which seems the mode:lock definition inconsistent.

From modeshape's document, the node type definition of mode:lock is
[mode:lock] > nt:base

• mode:lockedKey (string) protected ignore
• jcr:lockOwner (string) protected ignore
• mode:lockingSession (string) protected ignore
• mode:expirationDate (date) protected ignore
• mode:sessionScope (boolean) protected ignore
• jcr:isDeep (boolean) protected ignore
• mode:isHeldBySession (boolean) protected ignore
• mode:workspace (string) protected ignore

while i override this definition in the CND by ourself use below, it works:
[mode:lock] > nt:base

• jcr:lockOwner (string) protected ignore
• mode:lockToken (string) protected ignore
• mode:lockingSession (string) protected ignore
• mode:expirationDate (date) protected ignore
• mode:isSessionScoped (boolean) protected ignore
• jcr:lockIsDeep (boolean) protected ignore
• mode:isHeldBySession (boolean) protected ignore
• mode:workspace (string) protected ignore