EXFO FastReporter 2 - Manual (Page 152)

Working with OTDR Files
142 FastReporter 2
Managing Markers
When an event cannot be created in the specified position, an error
message is displayed. You cannot create any event in following conditions:

If the marker from any event is present in between markers A and B.
For example: In the below image the gray markers indicate the position
of the earlier event and the blue lines indicate the position where you
are trying to add new event. In this condition the application displays
an error message, to indicate that you cannot insert new event.
Markers of the
earlier event
Markers of the
new event