REQ_117.3: An LMS shall provide an enabled navigation UI device corresponding to a PreviousNavigation event:• The Current Activi

An LMS shall provide an enabled navigation UI device corresponding to a PreviousNavigation event:• The Current Activity is a child of a (Sequencing Control Mode) Flow equalsTrue cluster,• The Current Activity is a child of a (Sequencing Control Mode) Forward Onlyequals False cluster.• If the traversing Backward from the Current Activity will not result in walkingoff the root of the Activity Tree.